[arch-dev-public] Xorg-server 1.13/Mesa move to testing

The driver rebuilds in staging are done. So far these two drivers won't build with the new 1.13 server (xaa acceleration has been removed): sisimedia, unichrome If we won't find a fix these will be removed from our repos. All other drivers need some testing when they hit the testing repo. I'm going to push all Xorg/Mesa packages to testing even when Mesa is still not released. This will happen pretty soon and shouldn't harm our real life testing. I'll keep updating mesa in testing then. Xorg-xfs is useless nowadays and will be removed from the repos when new Xorg hits extra. -Andy