[Libva] libva test merge to master

[Yuan, Shengquan]

I will merge "test" branch into "master" in a few days. "test" branch
has a lot of patches from Gwenole, and is binary compatible with
previous VAAPI 29/30 applications. After that, we will branch out
"master" to another new "libva30" branch,  and then pick the four
libva31 patches

2009-07-08	Add new bit to signal VC-1 skipped P-frames.	Gwenole
Beauchesne	1	-1/+1
2009-07-08	Add new H.264 fields for XvBA backend.	Gwenole Beauchesne	1	-0/+4
2009-07-08	Add new VC-1 fields for VDPAU backend.	Gwenole Beauchesne	1	-5/+18
2009-07-08	Add new H.264 fields for VDPAU backend.