[PATCH] glamor: Add support for SHM sync fences

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> This hooks up SHM sync fences to complete the requirements for DRI3
> running on Glamor.
>
> Signed-off-by: Keith Packard <keithp at keithp.com>

This looks equivalent to what I had in my Xephyr DRI3 branch.

Reviewed-by: Eric Anholt <eric at anholt.net>
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