[PATCH 0/4] Fixes for X shared memory fence stuff

[Keith Packard]

Make sure the fences are allocated on the right file system:

 [PATCH 1/4] Select directory for MIT-SHM temp files at configure time
 [PATCH 2/4] Xext: Use SHMDIR and O_TMPFILE when creating mapping

Avoid consuming low file descriptors with shared memory fence FDs: 

 [PATCH 3/4] miext: Move SyncShm FDs out of the way of clients

libxshmfence API was fixed to use opaque type for the fence, require
the new version and use it:

 [PATCH 4/4] miext/sync: Handle libxshmfence API change

-keith