GHOST/X11: Xinput/XIM support caused double key-up

All keyboard events were sending double key events (including modifiers)
when xinput was enabled with gnome (causing much confusion!).

I cant test if XIM works,
but this isn't useful to send double events, so disabling for now.

intern/ghost/intern/GHOST_SystemX11.cpp

@@ -571,10 +571,8 @@ processEvents(
 			}
 
 			/* dispatch event to XIM server */
-			if ((XFilterEvent(&xevent, (Window)NULL) == True) && (xevent.type != KeyRelease)) {
+			if ((XFilterEvent(&xevent, (Window)NULL) == True)) {
-				/* do nothing now, the event is consumed by XIM.
+				/* do nothing now, the event is consumed by XIM. */
-				 * however, KeyRelease event should be processed
-				 * here, otherwise modifiers remain activated.   */
 				continue;
 			}
 #endif