am 2ac479fa: am a83987d2: Merge "RTP: integrate the echo canceller from speex." into gingerbread

Merge commit '2ac479faeb03daa5083d91726f7b639984617ba2'

* commit '2ac479faeb03daa5083d91726f7b639984617ba2':
  RTP: integrate the echo canceller from speex.