Fix for alt-tab in Windows.

utf8_buf can be not null terminated, plus not init as in this case. (I need to investigate more)

source/blender/windowmanager/intern/wm_event_system.c

@@ -2611,7 +2611,7 @@ void wm_event_add_ghostevent(wmWindowManager *wm, wmWindow *win, int type, int U
 			GHOST_TEventKeyData *kd= customdata;
 			event.type= convert_key(kd->key);
 			event.ascii= kd->ascii;
-			strcpy(event.utf8_buf, kd->utf8_buf);
+			memcpy(event.utf8_buf, kd->utf8_buf,sizeof(event.utf8_buf));/* might be not null terminated*/
 			event.val= (type==GHOST_kEventKeyDown)?KM_PRESS:KM_RELEASE;
 			
 			/* exclude arrow keys, esc, etc from text input */