[FFmpeg-cvslog] configure: select buffersink_filter when ffmpeg is enabled

[Stefano Sabatini]

On date Friday 2011-06-24 23:55:40 +0200, Stefano Sabatini wrote:
> ffmpeg | branch: master | Stefano Sabatini <stefano.sabatini-lala at poste.it> | Fri Jun 24 23:45:15 2011 +0200| [e65d6e22e300e286bcc27443df8449aaf9d062dd] | committer: Stefano Sabatini
> 
> configure: select buffersink_filter when ffmpeg is enabled
> 
> buffersink_filter is a strong requirement for compiling ffmpeg.
> Fixes ffmpeg compilation with --disable-everything.

Candidate for 0.7/0.8 backporting.