Fix autodetection of ffmpeg 2.2
Fix autodetection of ffmpeg 2.2

Drop minor version check, assuming this workaround is required for all
future versions. See 0a64272db65201fc2ecb3406b89d895966933b99. Fixes
issue #456.

DavidZemon/pianobar,bmbove/pianobar-save,tchajed/pianobar,johnso51/pianobar,gnowxilef/pianobar,twahlfeld/pianobar,twahlfeld/pianobar,tchajed/pianobar,johndeeney/pianobar,johnso51/pianobar,tchajed/pianobar,DavidZemon/pianobar,DavidZemon/pianobar,johnso51/pianobar,gnowxilef/pianobar,DavidZemon/pianobar,tchajed/pianobar,twahlfeld/pianobar,bmbove/pianobar-save,bmbove/pianobar-save,DavidZemon/pianobar,gnowxilef/pianobar,DavidZemon/pianobar,johnso51/pianobar,twahlfeld/pianobar,johnso51/pianobar,gnowxilef/pianobar,gnowxilef/pianobar,johndeeney/pianobar,gnowxilef/pianobar,johndeeney/pianobar,bmbove/pianobar-save,johndeeney/pianobar,johndeeney/pianobar,johnso51/pianobar,johndeeney/pianobar,bmbove/pianobar-save,twahlfeld/pianobar,tchajed/pianobar,tchajed/pianobar,twahlfeld/pianobar