Fixing a bug related to RCU in NetEQ

RCU was disabled due to that the RCU flag was overwritten with zero
in the packet buffer.

BUG=1156
TEST=trybots, neteq_unittests, audio_coding_module_test, audio_coding_unittests

Review URL: https://webrtc-codereview.appspot.com/969012

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3193 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed