Updates for latest ffmpeg library - also removed comments from ffmpeg svn checkout in configure that got inadvertently committed before.
Fixed IOCOM's proprietary H.264 decoding - Previously it was checking for a predefined byte start sequence but this wasn't always present. It has been changed to use the RTP payload type identifier (107 for IOCOM_H.264 or 96 for RFC3984 H.264) which is a better approach.

We should probably change VIC to use ffmpeg's AVPacket structures as well and we could probably eliminate some packet copying which would speed things up - but it seems to work pretty well at resolutions up to 960x720 (from IOCOM)
Merge commit 'd272a2a' into consolidated

- git merge from mpeg4 into cc branch.