LSan suppressions for libjingle_peerconnection_unittest

Some more leaks have entered the code a while ago so
I'm suppressing them to green up the bot again.

BUG=2528
TEST=Successful execution of the test using the steps described in webrtc:2528.
TBR=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4419004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5177 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed