ffmpeg: update to 1.2.1; libavutil soname bump.
audacious-plugins: rebuild against ffmpeg>=1.2.
idjc: rebuild against ffmpeg>=1.2.
cherokee: rebuild against ffmpeg>=1.2.
nepomuk-core: rebuild against ffmpeg>=1.2.
vlc: rebuild against ffmpeg>=1.2.
lightspark: rebuild against ffmpeg>=1.2.