[ubuntu-x] -ati pre-6.12.0 snapshot debs (r6xx/r7xx support)

[Bryce Harrington]

I've uploaded a git snapshot of upstream's R6xx/R7xx branch to my PPA:

  https://edge.launchpad.net/~bryceharrington/+archive/ppa

Note that this probably needs the kernel changes before it actually
enables 6xx/7xx support, however I'd love to get testing feedback on it.

What we're looking for is regressions, so I'm particularly interested in
hearing testing results from R5xx users and earlier.

Bryce