WINGs: deliver maskless events (selection, mapping) to all handlers

Selection and mapping events have mask 0 in the type table (matching
X11 semantics where they bypass event masks). Change the dispatch
check to deliver events with mask==0 to all registered handlers,
so these events are not silently dropped.

WINGs/wevent.c

@@ -265,7 +265,7 @@ int WMHandleEvent(WMEvent * event)
 	W_RetainView(toplevel);
 
 	WM_ITERATE_ARRAY(view->eventHandlers, hPtr, iter) {
-		if ((hPtr->eventMask & mask)) {
+		if (mask == 0 || (hPtr->eventMask & mask)) {
 			(*hPtr->proc) (event, hPtr->clientData);
 		}
 	}