Remove macOS port

We now have a proper native PC port (Moonlight Qt) and if we
wanted to bring the full iOS app over we can now use Catalyst.

Limelight/Input/OnScreenControls.h

@@ -25,12 +25,10 @@ typedef NS_ENUM(NSInteger, OnScreenControlsLevel) {
     OnScreenControlsLevelAutoGCExtendedGamepadWithStickButtons
 };
 
-#if TARGET_OS_IPHONE
 - (id) initWithView:(UIView*)view controllerSup:(ControllerSupport*)controllerSupport swipeDelegate:(id<EdgeDetectionDelegate>)edgeDelegate;
 - (BOOL) handleTouchDownEvent:(NSSet*)touches;
 - (BOOL) handleTouchUpEvent:(NSSet*)touches;
 - (BOOL) handleTouchMovedEvent:(NSSet*)touches;
 - (void) setLevel:(OnScreenControlsLevel)level;
-#endif
 
 @end