Renamed SDL events for clarity

Fixes https://github.com/libsdl-org/SDL/issues/6877

test/testspriteminimal.c

@@ -83,7 +83,7 @@ void loop()
 
     /* Check for events */
     while (SDL_PollEvent(&event)) {
-        if (event.type == SDL_QUIT || event.type == SDL_KEYDOWN) {
+        if (event.type == SDL_EVENT_QUIT || event.type == SDL_EVENT_KEY_DOWN) {
             done = 1;
         }
     }