adds descriptions to the libavcodec AVOptions array, taken from the

OptionDef options[] array.
Patch by Takis,
Original thread:
Date: Sep 11, 2006 3:39 PM
Subject: [Ffmpeg-devel] [PATCH] AVOptions description sync


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6243 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b