main: SDL_AppQuit() now reports the result value.

Fixes #10994.

examples/game/01-snake/snake.c

@@ -320,7 +320,7 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
     return SDL_APP_CONTINUE;
 }
 
-void SDL_AppQuit(void *appstate)
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
 {
     if (appstate != NULL) {
         AppState *as = (AppState *)appstate;