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5039226 Whitebox animation causes Solaris desktop hang

This problem is caused by a dead lock between java_vm and Xserver:
Xserver is grabbed by java_vm and waiting for XUngrabServer, java_vm
thought XUngrabServer was already sent and sends another dga lock
request to Xserver and blocked on that request. Here is what happened:
java_vm threads calls XGrabServer and XUngrabServer and then
Solaris_DGA_GetLock, it seems no problem, but the current
XUngrabServer requires a XSync call after XUngrabServer in MT
environment to make sure Xserver is ungrabbed *before* new lock
requests come in. Without this XSync, a dead lock may formed just like
this case.

diff --git a/src/UngrabSvr.c b/src/UngrabSvr.c
index ea00848..cea7f99 100644
--- a/src/UngrabSvr.c
+++ b/src/UngrabSvr.c
@@ -39,6 +39,9 @@ XUngrabServer (
         GetEmptyReq(UngrabServer, req);
         UnlockDisplay(dpy);
 	SyncHandle();
+	/* fix for bug 5039226: desktop hangs */
+	if (!dpy->synchandler)
+	    XSync(dpy, 0);
 	return 1;
 }