xf86-video-intel: Changes to 'dri2-swapbuffers'

[Jesse Barnes]

New branch 'dri2-swapbuffers' available with the following commits:
commit 041ec99a396291c5da70816205634f8c49eb5fa1
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Fri May 1 14:52:26 2009 -0700

    Add support for DRI2 SwapBuffers request
    
    Support the new DRI2 SwapBuffers request with a KMS-specific page flip ioctl.
    Doesn't help prevent tearing from CopyRegion requests, but full buffer swaps
    look nice.
    
    There's still an open issue with buffer resize in here somewhere; maybe
    pI830->front_buffer isn't getting fully fixed up at swap time?