hw/xwin: Give the X window for the clipboard integration client a name

This makes it a bit easier to find when staring at the output of
'xwininfo -tree -root'

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>

hw/xwin/winclipboardthread.c

@@ -236,6 +236,8 @@ winClipboardProc (void *pvNotUsed)
       pthread_exit (NULL);
     }
 
+  XStoreName(pDisplay, iWindow, "xwinclip");
+
   /* Select event types to watch */
   if (XSelectInput (pDisplay,
 		    iWindow,