[git] Support for new DRI2 protocol

[Jesse B. <jb...@vi...>]

DRI2 now has support for swapbuffers, OML_sync_control and events.
There's a git tree at git://people.freedesktop.org/~jbarnes/mesa with
support for the new requests that I'd like to push into Mesa master.

Can people take a look at make sure I don't have anything horribly
wrong?  I've tested it against both old and new X servers (that is,
servers with and w/o support for the new requests) and things seem
solid, so I think it's ready to go.

Building does require current dri2proto bits (all of which are in
dri2proto master); I should probably spin a release of that just to
make things easy.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center