[PATCH] GLX/DRI2: Do not expose INTEL_swap_event without swap control

[Keith Packard]

Zack Rusin <zackr at vmware.com> writes:

> Swap events depent on the implementation of ScheduleSwap. By
> unconditionally enabling GLX_INTEL_swap_event we're breaking
> the system with drivers that don't support it because the apps
> are forever stuck waiting for an event that will never be
> delivered. So lets enable the extension only if the hooks it
> depends on are actually there.

Merged.
   116f020..190b032  master -> master

-- 
keith.packard at intel.com
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