[reSIProcate] Patch for rutil

[Karlsson]

I watch a bug/defect in the rutil/stun, with currently code, the recvfrom
function which in the udp.cxx will be block then cause the application
freeze  if the stun server IP/domain is not live(not respond).  I have
created a patch which is set the socket timeout to 600 ms, and it will try
three times if failed, just for reference.

PS: this patch is works very well for me.
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