Update SDL2 to newest version to fix 7.1 playback

This fixes 7.1 playback. Before this commit, SDL used 7.1 front audio configuration with Center Left and Center Right speakers, but without Rear speakers.

See https://github.com/libsdl-org/SDL/issues/11709 for more details.

libs/SDL2/include/SDL_sensor.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -20,10 +20,9 @@
 */
 
 /**
- *  \file SDL_sensor.h
- *
- *  Include file for SDL sensor event handling
+ * # CategorySensor
  *
+ * Include file for SDL sensor event handling
  */
 
 #ifndef SDL_sensor_h_
@@ -44,7 +43,7 @@ extern "C" {
  *  \brief SDL_sensor.h
  *
  *  In order to use these functions, SDL_Init() must have been called
- *  with the ::SDL_INIT_SENSOR flag.  This causes SDL to scan the system
+ *  with the SDL_INIT_SENSOR flag.  This causes SDL to scan the system
  *  for sensors, and load appropriate drivers.
  */
 
@@ -52,21 +51,67 @@ struct _SDL_Sensor;
 typedef struct _SDL_Sensor SDL_Sensor;
 
 /**
- * This is a unique ID for a sensor for the time it is connected to the system,
- * and is never reused for the lifetime of the application.
+ * This is a unique ID for a sensor for the time it is connected to the
+ * system, and is never reused for the lifetime of the application.
  *
- * The ID value starts at 0 and increments from there. The value -1 is an invalid ID.
+ * The ID value starts at 0 and increments from there. The value -1 is an
+ * invalid ID.
  */
 typedef Sint32 SDL_SensorID;
 
-/* The different sensors defined by SDL
+/**
+ * The different sensors defined by SDL.
  *
  * Additional sensors may be available, using platform dependent semantics.
  *
- * Hare are the additional Android sensors:
+ * Here are the additional Android sensors:
+ *
  * https://developer.android.com/reference/android/hardware/SensorEvent.html#values
+ *
+ * Accelerometer sensor notes:
+ *
+ * The accelerometer returns the current acceleration in SI meters per second
+ * squared. This measurement includes the force of gravity, so a device at
+ * rest will have an value of SDL_STANDARD_GRAVITY away from the center of the
+ * earth, which is a positive Y value.
+ *
+ * - `values[0]`: Acceleration on the x axis
+ * - `values[1]`: Acceleration on the y axis
+ * - `values[2]`: Acceleration on the z axis
+ *
+ * For phones and tablets held in natural orientation and game controllers
+ * held in front of you, the axes are defined as follows:
+ *
+ * - -X ... +X : left ... right
+ * - -Y ... +Y : bottom ... top
+ * - -Z ... +Z : farther ... closer
+ *
+ * The accelerometer axis data is not changed when the device is rotated.
+ *
+ * Gyroscope sensor notes:
+ *
+ * The gyroscope returns the current rate of rotation in radians per second.
+ * The rotation is positive in the counter-clockwise direction. That is, an
+ * observer looking from a positive location on one of the axes would see
+ * positive rotation on that axis when it appeared to be rotating
+ * counter-clockwise.
+ *
+ * - `values[0]`: Angular speed around the x axis (pitch)
+ * - `values[1]`: Angular speed around the y axis (yaw)
+ * - `values[2]`: Angular speed around the z axis (roll)
+ *
+ * For phones and tablets held in natural orientation and game controllers
+ * held in front of you, the axes are defined as follows:
+ *
+ * - -X ... +X : left ... right
+ * - -Y ... +Y : bottom ... top
+ * - -Z ... +Z : farther ... closer
+ *
+ * The gyroscope axis data is not changed when the device is rotated.
+ *
+ * \sa SDL_GetDisplayOrientation
  */
-typedef enum
+typedef enum SDL_SensorType
 {
     SDL_SENSOR_INVALID = -1,    /**< Returned for an invalid sensor */
     SDL_SENSOR_UNKNOWN,         /**< Unknown sensor type */
@@ -79,53 +124,15 @@ typedef enum
 } SDL_SensorType;
 
 /**
- * Accelerometer sensor
+ * A constant to represent standard gravity for accelerometer sensors.
  *
- * The accelerometer returns the current acceleration in SI meters per
- * second squared. This measurement includes the force of gravity, so
- * a device at rest will have an value of SDL_STANDARD_GRAVITY away
- * from the center of the earth, which is a positive Y value.
- *
- * values[0]: Acceleration on the x axis
- * values[1]: Acceleration on the y axis
- * values[2]: Acceleration on the z axis
- *
- * For phones held in portrait mode and game controllers held in front of you,
- * the axes are defined as follows:
- * -X ... +X : left ... right
- * -Y ... +Y : bottom ... top
- * -Z ... +Z : farther ... closer
- * 
- * The axis data is not changed when the phone is rotated.
- *
- * \sa SDL_GetDisplayOrientation()
+ * The accelerometer returns the current acceleration in SI meters per second
+ * squared. This measurement includes the force of gravity, so a device at
+ * rest will have an value of SDL_STANDARD_GRAVITY away from the center of the
+ * earth, which is a positive Y value.
  */
 #define SDL_STANDARD_GRAVITY    9.80665f
 
-/**
- * Gyroscope sensor
- *
- * The gyroscope returns the current rate of rotation in radians per second.
- * The rotation is positive in the counter-clockwise direction. That is,
- * an observer looking from a positive location on one of the axes would
- * see positive rotation on that axis when it appeared to be rotating
- * counter-clockwise.
- *
- * values[0]: Angular speed around the x axis (pitch)
- * values[1]: Angular speed around the y axis (yaw)
- * values[2]: Angular speed around the z axis (roll)
- *
- * For phones held in portrait mode and game controllers held in front of you,
- * the axes are defined as follows:
- * -X ... +X : left ... right
- * -Y ... +Y : bottom ... top
- * -Z ... +Z : farther ... closer
- * 
- * The axis data is not changed when the phone or controller is rotated.
- *
- * \sa SDL_GetDisplayOrientation()
- */
-
 /* Function prototypes */
 
 /**
@@ -155,7 +162,7 @@ extern DECLSPEC int SDLCALL SDL_NumSensors(void);
 /**
  * Get the implementation dependent name of a sensor.
  *
- * \param device_index The sensor to obtain name from
+ * \param device_index The sensor to obtain name from.
  * \returns the sensor name, or NULL if `device_index` is out of range.
  *
  * \since This function is available since SDL 2.0.9.
@@ -165,7 +172,7 @@ extern DECLSPEC const char *SDLCALL SDL_SensorGetDeviceName(int device_index);
 /**
  * Get the type of a sensor.
  *
- * \param device_index The sensor to get the type from
+ * \param device_index The sensor to get the type from.
  * \returns the SDL_SensorType, or `SDL_SENSOR_INVALID` if `device_index` is
  *          out of range.
  *
@@ -176,7 +183,7 @@ extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetDeviceType(int device_index)
 /**
  * Get the platform dependent type of a sensor.
  *
- * \param device_index The sensor to check
+ * \param device_index The sensor to check.
  * \returns the sensor platform dependent type, or -1 if `device_index` is out
  *          of range.
  *
@@ -187,7 +194,7 @@ extern DECLSPEC int SDLCALL SDL_SensorGetDeviceNonPortableType(int device_index)
 /**
  * Get the instance ID of a sensor.
  *
- * \param device_index The sensor to get instance id from
+ * \param device_index The sensor to get instance id from.
  * \returns the sensor instance ID, or -1 if `device_index` is out of range.
  *
  * \since This function is available since SDL 2.0.9.
@@ -197,7 +204,7 @@ extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetDeviceInstanceID(int device_in
 /**
  * Open a sensor for use.
  *
- * \param device_index The sensor to open
+ * \param device_index The sensor to open.
  * \returns an SDL_Sensor sensor object, or NULL if an error occurred.
  *
  * \since This function is available since SDL 2.0.9.
@@ -207,7 +214,7 @@ extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorOpen(int device_index);
 /**
  * Return the SDL_Sensor associated with an instance id.
  *
- * \param instance_id The sensor from instance id
+ * \param instance_id The sensor from instance id.
  * \returns an SDL_Sensor object.
  *
  * \since This function is available since SDL 2.0.9.
@@ -217,7 +224,7 @@ extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorFromInstanceID(SDL_SensorID instan
 /**
  * Get the implementation dependent name of a sensor
  *
- * \param sensor The SDL_Sensor object
+ * \param sensor The SDL_Sensor object.
  * \returns the sensor name, or NULL if `sensor` is NULL.
  *
  * \since This function is available since SDL 2.0.9.
@@ -227,7 +234,7 @@ extern DECLSPEC const char *SDLCALL SDL_SensorGetName(SDL_Sensor *sensor);
 /**
  * Get the type of a sensor.
  *
- * \param sensor The SDL_Sensor object to inspect
+ * \param sensor The SDL_Sensor object to inspect.
  * \returns the SDL_SensorType type, or `SDL_SENSOR_INVALID` if `sensor` is
  *          NULL.
  *
@@ -238,7 +245,7 @@ extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetType(SDL_Sensor *sensor);
 /**
  * Get the platform dependent type of a sensor.
  *
- * \param sensor The SDL_Sensor object to inspect
+ * \param sensor The SDL_Sensor object to inspect.
  * \returns the sensor platform dependent type, or -1 if `sensor` is NULL.
  *
  * \since This function is available since SDL 2.0.9.
@@ -248,7 +255,7 @@ extern DECLSPEC int SDLCALL SDL_SensorGetNonPortableType(SDL_Sensor *sensor);
 /**
  * Get the instance ID of a sensor.
  *
- * \param sensor The SDL_Sensor object to inspect
+ * \param sensor The SDL_Sensor object to inspect.
  * \returns the sensor instance ID, or -1 if `sensor` is NULL.
  *
  * \since This function is available since SDL 2.0.9.
@@ -260,9 +267,9 @@ extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetInstanceID(SDL_Sensor *sensor)
  *
  * The number of values and interpretation of the data is sensor dependent.
  *
- * \param sensor The SDL_Sensor object to query
- * \param data A pointer filled with the current sensor state
- * \param num_values The number of values to write to data
+ * \param sensor The SDL_Sensor object to query.
+ * \param data A pointer filled with the current sensor state.
+ * \param num_values The number of values to write to data.
  * \returns 0 or -1 if an error occurred.
  *
  * \since This function is available since SDL 2.0.9.
@@ -275,11 +282,11 @@ extern DECLSPEC int SDLCALL SDL_SensorGetData(SDL_Sensor *sensor, float *data, i
  *
  * The number of values and interpretation of the data is sensor dependent.
  *
- * \param sensor The SDL_Sensor object to query
+ * \param sensor The SDL_Sensor object to query.
  * \param timestamp A pointer filled with the timestamp in microseconds of the
- *                  current sensor reading if available, or 0 if not
- * \param data A pointer filled with the current sensor state
- * \param num_values The number of values to write to data
+ *                  current sensor reading if available, or 0 if not.
+ * \param data A pointer filled with the current sensor state.
+ * \param num_values The number of values to write to data.
  * \returns 0 or -1 if an error occurred.
  *
  * \since This function is available since SDL 2.26.0.
@@ -289,7 +296,7 @@ extern DECLSPEC int SDLCALL SDL_SensorGetDataWithTimestamp(SDL_Sensor *sensor, U
 /**
  * Close a sensor previously opened with SDL_SensorOpen().
  *
- * \param sensor The SDL_Sensor object to close
+ * \param sensor The SDL_Sensor object to close.
  *
  * \since This function is available since SDL 2.0.9.
  */