vaapi g45-h264 is still not usable

To install it, run

git clone cgit.freedesktop.org/vaapi/intel-driver/ -b g45-h264

then build the source and copy the *.so into the correct location.

But after installation, test it by [QYQ][BDrip][AIR][OP_Longver.A][AVC_FLAC][3769CFBF].mkv you may find it’s too slow to play. And black blocks occasional appears when it’s playing.

`mplayer2 -vc ffh264 -lavdopts threads=2 -benchmark -nosound` takes 104.122s to decode;
`mplayer-vaapi -benchmark -nosound` takes 196.749s.

But the total length of the video is only 201s.