am 91fe7464: am 14e00621: Merge "Revert "RTP: integrate the echo canceller from speex."" into gingerbread

Merge commit '91fe746437e1709b83b4eb4d113e5f435d7c6412'

* commit '91fe746437e1709b83b4eb4d113e5f435d7c6412':
  Revert "RTP: integrate the echo canceller from speex."