Make it possible to reuse UDP socket (optional, disabled by default)

Patch by Thijs % thijsvermeir A telenet P be %
Original thread:
Subject: Re: [Ffmpeg-devel] [PATCH proposal] Reuse UDP socket v2
Date: October 28, 2006 11:09:00 AM CEDT

Originally committed as revision 6825 to svn://svn.ffmpeg.org/ffmpeg/trunk