updated ffmpeg-builddep package.
deleted --enable-shared option; it may cause some problems.
added ffmpeg-builddep package
do not build ffpreset package by default
added libvdpau-dev to build dependency
changed ffmpeg version.
added libav-dev to dependency list
merging Launchpad...
deleting --diable-stripping from ffmpeg's configure option
switching ffmpeg's repository SVN -> git