RPM uses `/usr` instead of `/usr/local` as the prefix.
Merge pull request #168 from librehat/master

RPM uses `/usr` instead of `/usr/local` as the prefix.
Merge remote-tracking branch 'refs/remotes/madeye/master'
refine the udp connection cache
Update udprelay.c
allow to send broadcast
Merge remote-tracking branch 'refs/remotes/madeye/master'