Apply patch from Adub (https://gist.github.com/adworacz) to check for libavcodec dependency.



git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@430 f9120d27-2007-6f97-8312-0f4ebfa7710f
Remove commented out code

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@431 f9120d27-2007-6f97-8312-0f4ebfa7710f