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_keyboard.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
@@ -20,9 +20,9 @@
 */
 
 /**
- *  \file SDL_keyboard.h
+ * # CategoryKeyboard
  *
- *  Include file for SDL keyboard event handling
+ * Include file for SDL keyboard event handling
  */
 
 #ifndef SDL_keyboard_h_
@@ -40,14 +40,15 @@ extern "C" {
 #endif
 
 /**
- *  \brief The SDL keysym structure, used in key events.
+ * The SDL keysym structure, used in key events.
  *
- *  \note  If you are looking for translated character input, see the ::SDL_TEXTINPUT event.
+ * If you are looking for translated character input, see the SDL_TEXTINPUT
+ * event.
  */
 typedef struct SDL_Keysym
 {
-    SDL_Scancode scancode;      /**< SDL physical key code - see ::SDL_Scancode for details */
-    SDL_Keycode sym;            /**< SDL virtual key code - see ::SDL_Keycode for details */
+    SDL_Scancode scancode;      /**< SDL physical key code - see SDL_Scancode for details */
+    SDL_Keycode sym;            /**< SDL virtual key code - see SDL_Keycode for details */
     Uint16 mod;                 /**< current key modifiers */
     Uint32 unused;
 } SDL_Keysym;
@@ -84,7 +85,7 @@ extern DECLSPEC SDL_Window * SDLCALL SDL_GetKeyboardFocus(void);
  * Note: This function doesn't take into account whether shift has been
  * pressed or not.
  *
- * \param numkeys if non-NULL, receives the length of the returned array
+ * \param numkeys if non-NULL, receives the length of the returned array.
  * \returns a pointer to an array of key states.
  *
  * \since This function is available since SDL 2.0.0.
@@ -129,7 +130,7 @@ extern DECLSPEC SDL_Keymod SDLCALL SDL_GetModState(void);
  * This does not change the keyboard state, only the key modifier flags that
  * SDL reports.
  *
- * \param modstate the desired SDL_Keymod for the keyboard
+ * \param modstate the desired SDL_Keymod for the keyboard.
  *
  * \since This function is available since SDL 2.0.0.
  *
@@ -143,7 +144,7 @@ extern DECLSPEC void SDLCALL SDL_SetModState(SDL_Keymod modstate);
  *
  * See SDL_Keycode for details.
  *
- * \param scancode the desired SDL_Scancode to query
+ * \param scancode the desired SDL_Scancode to query.
  * \returns the SDL_Keycode that corresponds to the given SDL_Scancode.
  *
  * \since This function is available since SDL 2.0.0.
@@ -159,7 +160,7 @@ extern DECLSPEC SDL_Keycode SDLCALL SDL_GetKeyFromScancode(SDL_Scancode scancode
  *
  * See SDL_Scancode for details.
  *
- * \param key the desired SDL_Keycode to query
+ * \param key the desired SDL_Keycode to query.
  * \returns the SDL_Scancode that corresponds to the given SDL_Keycode.
  *
  * \since This function is available since SDL 2.0.0.
@@ -183,7 +184,7 @@ extern DECLSPEC SDL_Scancode SDLCALL SDL_GetScancodeFromKey(SDL_Keycode key);
  * unsuitable for creating a stable cross-platform two-way mapping between
  * strings and scancodes.
  *
- * \param scancode the desired SDL_Scancode to query
+ * \param scancode the desired SDL_Scancode to query.
  * \returns a pointer to the name for the scancode. If the scancode doesn't
  *          have a name this function returns an empty string ("").
  *
@@ -197,7 +198,7 @@ extern DECLSPEC const char *SDLCALL SDL_GetScancodeName(SDL_Scancode scancode);
 /**
  * Get a scancode from a human-readable name.
  *
- * \param name the human-readable scancode name
+ * \param name the human-readable scancode name.
  * \returns the SDL_Scancode, or `SDL_SCANCODE_UNKNOWN` if the name wasn't
  *          recognized; call SDL_GetError() for more information.
  *
@@ -214,7 +215,7 @@ extern DECLSPEC SDL_Scancode SDLCALL SDL_GetScancodeFromName(const char *name);
  *
  * See SDL_Scancode and SDL_Keycode for details.
  *
- * \param key the desired SDL_Keycode to query
+ * \param key the desired SDL_Keycode to query.
  * \returns a pointer to a UTF-8 string that stays valid at least until the
  *          next call to this function. If you need it around any longer, you
  *          must copy it. If the key doesn't have a name, this function
@@ -231,7 +232,7 @@ extern DECLSPEC const char *SDLCALL SDL_GetKeyName(SDL_Keycode key);
 /**
  * Get a key code from a human-readable name.
  *
- * \param name the human-readable key name
+ * \param name the human-readable key name.
  * \returns key code, or `SDLK_UNKNOWN` if the name wasn't recognized; call
  *          SDL_GetError() for more information.
  *
@@ -253,6 +254,10 @@ extern DECLSPEC SDL_Keycode SDLCALL SDL_GetKeyFromName(const char *name);
  *
  * On some platforms using this function activates the screen keyboard.
  *
+ * On desktop platforms, SDL_StartTextInput() is implicitly called on SDL
+ * window creation which will cause events SDL_TextInputEvent and
+ * SDL_TextEditingEvent to begin emitting.
+ *
  * \since This function is available since SDL 2.0.0.
  *
  * \sa SDL_SetTextInputRect
@@ -300,6 +305,9 @@ extern DECLSPEC SDL_bool SDLCALL SDL_IsTextInputShown(void);
 /**
  * Set the rectangle used to type Unicode text inputs.
  *
+ * Native input methods will place a window with word suggestions near it,
+ * without covering the text being inputted.
+ *
  * To start text input in a given location, this function is intended to be
  * called before SDL_StartTextInput, although some platforms support moving
  * the rectangle even while text input (and a composition) is active.
@@ -309,7 +317,7 @@ extern DECLSPEC SDL_bool SDLCALL SDL_IsTextInputShown(void);
  * any feedback.
  *
  * \param rect the SDL_Rect structure representing the rectangle to receive
- *             text (ignored if NULL)
+ *             text (ignored if NULL).
  *
  * \since This function is available since SDL 2.0.0.
  *
@@ -333,7 +341,7 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasScreenKeyboardSupport(void);
 /**
  * Check whether the screen keyboard is shown for given window.
  *
- * \param window the window for which screen keyboard should be queried
+ * \param window the window for which screen keyboard should be queried.
  * \returns SDL_TRUE if screen keyboard is shown or SDL_FALSE if not.
  *
  * \since This function is available since SDL 2.0.0.