Adding TSAN suppression for test posix udp transport.

This is race for reading a bool in the WebRTC test UDP transport and
not in any production code.

R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2159006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4663 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed