Fixed Windows build due to an implicit memcpy generated by the optimizer

src/events/SDL_gesture.c

@@ -481,7 +481,7 @@ int SDL_GestureDelTouch(SDL_TouchID touchId)
     SDL_zero(SDL_gestureTouch[i]);
 
     SDL_numGestureTouches--;
-    SDL_gestureTouch[i] = SDL_gestureTouch[SDL_numGestureTouches];
+    SDL_memcpy(&SDL_gestureTouch[i], &SDL_gestureTouch[SDL_numGestureTouches], sizeof(SDL_gestureTouch[i]));
     return 0;
 }