- update to 3.0 prerelease 2.99.902
- switch to SNA as default acceleration method, i.e. taking the new
  upstream default

- Update to version 2.21.15:
  Some build fixes for the BSDs and alternate compiler, and conflicting
  configure options and a critcial fix for some PRIME setups.
  + Don't fail to configure if DRI1 is not available and the user asks
    for both DRI and KMS-only [Regression from 2.21.14]
  + Lots of miscellaneous fixes for older gcc, other compilers and BSD.
  + Initial framework support for hosted X.
  + Improve transition from fbcon to X with multiple outputs and extended
    desktops.
  + Ensure the framebuffer exists before checking it against the CRTC
    constraints.
    https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/121234
    [Regression from 2.21.10]
  + Add RGB overlay support for Ironlake and later.
  + Don't release the overlay buffer too early, i.e. before the client
    disables the Xv image.
  + Tweak the ring switching logic to reduce use of semaphores on
    Sandybridge and later - a delicate balancing act between trying to
    use the faster engine for the task and preventing concurrent use of
    multiple rings.
- Packaging changes:
  + Remove xf86-video-intel-copyfb.diff (patch1)
    Remove this old and long disabled patch. We shipped at least 12.3
    wihout it!

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