Avoid access to System V shared memory segment on the X server side
for clients forwarded via SSH. Also prevent them from hanging while
waiting for the reply from the ShmCreateSegment request.
v2: Allow ShmQueryVersion request even for remote clients
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=11080
Signed-off-by: Alexander Volkov <a.volkov@rusbitech.ru>
Reviewed-by: Adam Jackson <ajax@redhat.com>