xorg-server: add some new default configure options

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.12.5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
config/graphic: enable (temporary)xinerama support for R600 GPUs

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Mesa: update to Mesa-10.0.1

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