Added a macro SDL_TICKS_PASSED() to correctly compare two 32-bit tick values.

Went through the code and used the macro and fixed a couple places that were using incorrect timestamp comparisons.

src/events/SDL_events.c

@@ -443,7 +443,7 @@ SDL_WaitEventTimeout(SDL_Event * event, int timeout)
                 /* Polling and no events, just return */
                 return 0;
             }
-            if (timeout > 0 && ((int) (SDL_GetTicks() - expiration) >= 0)) {
+            if (timeout > 0 && SDL_TICKS_PASSED(SDL_GetTicks(), expiration)) {
                 /* Timeout expired and no events */
                 return 0;
             }