Enabling unit tests for NetEq4 in the bots

The unit tests for NetEq4 are made a part of audio_coding_unittests.

The bit-exactness tests are disabled due to problems in iLBC. See
https://code.google.com/p/webrtc/issues/detail?id=281.

A few smaller fixes for valgrind errors and bot failures are included.
Some of the fixes are adpted from
http://webrtc-codereview.appspot.com/1072008/.

Review URL: https://webrtc-codereview.appspot.com/1063012

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3432 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed