[FFmpeg-devel] V4L2 M2M version 5

[Jorge Ramirez-Ortiz]

This commit fixes the broken build on platforms not support v4l2_m2m
but supporting v4l - this has been tested on ubuntu 10.04, 2.6.xx
kernel.

It also fixes a regression introduced in libavcodec/Makefile with v4.

Fate suite and encoders/decoders tested as per the comments in the
main functional commit in the patchset (ie, 4/4) 

looking forward to more comments and thanks for your help.