Made SDL_WINDOWEVENT_* and SDL_DISPLAYEVENT_* first class event types

Fixes https://github.com/libsdl-org/SDL/issues/6772

test/testdrawchessboard.c

@@ -56,7 +56,7 @@ void loop()
     while (SDL_PollEvent(&e)) {
 
         /* Re-create when window has been resized */
-        if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) {
+        if (e.type == SDL_WINDOWEVENT_SIZE_CHANGED) {
 
             SDL_DestroyRenderer(renderer);