Make sure we call SDL_Quit() before SDLTest_CommonDestroyState()

Otherwise we'll report leaks that will be cleaned up in SDL_Quit()

test/loopwave.c

@@ -134,6 +134,7 @@ void SDL_AppQuit(void *appstate)
 {
     SDL_DestroyAudioStream(stream);
     SDL_free(wave.sound);
+    SDL_Quit();
     SDLTest_CommonDestroyState(state);
 }