am a83987d2: Merge "RTP: integrate the echo canceller from speex." into gingerbread

Merge commit 'a83987d2ccc6b235dd3dd5cc6206c257dfe9e0a8' into gingerbread-plus-aosp

* commit 'a83987d2ccc6b235dd3dd5cc6206c257dfe9e0a8':
  RTP: integrate the echo canceller from speex.