Mesa: update to Mesa-9.2-rc2

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/Generic_OSS/linux: force enable audio on Radeon GPUs

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-ati: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-ati: update to xf86-video-ati-7.2.0

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nouveau: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nouveau: update to xf86-video-nouveau-1.0.9

Signed-off-by: Stephan Raue <stephan@openelec.tv>