EventThread: ifdef out broken SDL function on OSX

src/eventthread.cpp

@@ -116,7 +116,11 @@ void EventThread::process(RGSSThreadData &rtData)
 	UnidirMessage<Vec2i> &windowSizeMsg = rtData.windowSizeMsg;
 
 	initALCFunctions(rtData.alcDev);
+
+	// XXX this function breaks input focus on OSX
+#ifndef __MACOSX__
 	SDL_SetEventFilter(eventFilter, &rtData);
+#endif
 
 	fullscreen = rtData.config.fullscreen;
 	int toggleFSMod = rtData.config.anyAltToggleFS ? KMOD_ALT : KMOD_LALT;