Start work on 2:9.010-0ubuntu1
debian/substvars: remove versioned dependency on xserver-xorg-core
Ubuntu: fix paths which prevented OpenGL operations on hybrid systems on amd64

Thanks to Nick Andrik for the patch.
Add support for Linux 3.8

Thanks to Robert Hooker for the patch.
Release 2:9.010-0ubuntu1
Start work on 2:9.010-0ubuntu2
Drop all the dependencies on the linux-headers
Drop redundant dependency on the xserver
Release 2:9.010-0ubuntu2