[Nvrec-open] Avifile divx support removed

[Heikki L. <hol...@cs...>]

Same drill, different target:
Divxfile support was unmaintained, non-working, and obsoleted by ffmpeg. 
In order to clean up the nvrec code base, support for avifile divx has 
been removed from the SVN. Users needing divxrec should use older releases.

-- Heikki Lindholm