[PATCH][V4][xserver] configure.ac: add option for xshmfence

[Keith Packard]

Ross Burton <ross.burton at intel.com> writes:

> xshmfence is usable outside of DRI3, and is currently autodetected which isn't
> good for distributions where deterministic builds are desired.

Merged (with review).
   2172714..4afedf5  master -> master

-- 
keith.packard at intel.com
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