events: SDL_WaitEvent()'s polling loop now sleeps 1ms instead of 10ms.

Fixes Bugzilla #4356.

src/events/SDL_events.c

@@ -728,7 +728,7 @@ SDL_WaitEventTimeout(SDL_Event * event, int timeout)
                 /* Timeout expired and no events */
                 return 0;
             }
-            SDL_Delay(10);
+            SDL_Delay(1);
             break;
         default:
             /* Has events */