Windows: cm_serverLock read required not write

Windows: cm_serverLock read required not write

Reviewed-on: http://gerrit.openafs.org/5301
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit bca64c70467afd00ca02290a4236bc295ec4633c)

Change-Id: I9c0c04ce619f2f85ae821621f9468715ba7deefe
Reviewed-on: http://gerrit.openafs.org/6797
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>