SDLApplication: fix crash in SDL_Quit on Windows by calling SDL_QuitSubSystem first with the same flags passed to SDL_Init (closes openfl#1934)

As far as I can tell, SDL_QuitSubSystem is not required, and SDL_Quit should automatically quit each subsystem. However, this stops the crash, so maybe there's some kind of race condition that this avoids.

Author: joshtynjala

project/src/backend/sdl/SDLApplication.cpp

@@ -25,7 +25,7 @@ namespace lime {
 
 	SDLApplication::SDLApplication () {
 
-		Uint32 initFlags = SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER | SDL_INIT_TIMER | SDL_INIT_JOYSTICK;
+		initFlags = SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER | SDL_INIT_TIMER | SDL_INIT_JOYSTICK;
 		#if defined(LIME_MOJOAL) || defined(LIME_OPENALSOFT)
 		initFlags |= SDL_INIT_AUDIO;
 		#endif
@@ -814,6 +814,8 @@ namespace lime {
 		applicationEvent.type = EXIT;
 		ApplicationEvent::Dispatch (&applicationEvent);
 
+		SDL_QuitSubSystem (initFlags);
+
 		SDL_Quit ();
 
 		return 0;

project/src/backend/sdl/SDLApplication.h

@@ -63,6 +63,7 @@ namespace lime {
 			ClipboardEvent clipboardEvent;
 			Uint32 currentUpdate;
 			double framePeriod;
+			Uint32 initFlags;
 			DropEvent dropEvent;
 			GamepadEvent gamepadEvent;
 			JoystickEvent joystickEvent;