engine: drop raw SDL joystick API, always use GameController instead. Implement actually working rumble, ensure we're freeing up all resources related to gamepads

engine/platform/dos/in_dos.c

@@ -91,11 +91,16 @@ void GAME_EXPORT Platform_SetMousePos(int x, int y)
 
 }
 
-int Platform_JoyInit( int numjoy )
+int Platform_JoyInit( void )
 {
 	return 0;
 }
 
+void Platform_JoyShutdown( void )
+{
+
+}
+
 void Platform_EnableTextInput( qboolean enable )
 {
 	keystate.chars = enable;