Fix Windows compile

client/gui/NotificationHandler.cpp

@@ -11,6 +11,7 @@
 #include "StdInc.h"
 #include "NotificationHandler.h"
 #include <SDL_video.h>
+#include <SDL_events.h>
 #include <SDL_syswm.h>
 
 #if defined(VCMI_WINDOWS)
@@ -156,4 +157,4 @@ bool NotificationHandler::handleSdlEvent(const SDL_Event & ev)
 	return false;
 }
 
-#endif
+#endif