Fixes a deadlock in the ICE implementation between Agent.free() and StunClientTransaction observed in Jitsi Videobridge.
Fixes a deadlock in the ICE implementation between Agent.free() and StunClientTransaction observed in Jitsi Videobridge.

HappyYang/libjitsi,agh1467/libjitsi,stokito/libjnvpx,jitsi/libjitsi,bebo/libjitsi,ITNano/libjitsi,draekko/libjitsi,agh1467/libjitsi,stokito/libjnvpx,bgrozev/libjitsi,ITNano/libjitsi,gpolitis/libjitsi,bgrozev/libjitsi,jitsi/libjitsi,gpolitis/libjitsi,HappyYang/libjitsi,jitsi/libjitsi,innerverse/libjitsi,agh1467/libjitsi,innerverse/libjitsi,gpolitis/libjitsi,jamesbond12/libjitsi,bebo/libjitsi,bgrozev/libjitsi,HappyYang/libjitsi,innerverse/libjitsi,bebo/libjitsi,jitsi/libjitsi,draekko/libjitsi,jamesbond12/libjitsi,ITNano/libjitsi,draekko/libjitsi,jamesbond12/libjitsi