PATCH: move intel crtc xv clipping helper to the xserver

[Alex Deucher]

The code is generic and can be used by any overlay-based card when
adding randr 1.2 support.  Tested on radeon.  It would be nice to get
this in for 7.3 so we can start to switch drivers over.  see bug
12053:
https://bugs.freedesktop.org/show_bug.cgi?id=12053

Thanks,

Alex
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