Windows: Interlocked ops for cm_volume

Windows: Interlocked ops for cm_volume

Use Interlocked operations for protection of cm_volume flags and
qFlags as well as cm_vol_state flags.

Reviewed-on: http://gerrit.openafs.org/5194
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit cbd075a36000d0b54b64eb7d9736587b27a08e9e)

Change-Id: Ib2b11cbadcbdbc244866d6bf90ab4d55ef589819
Reviewed-on: http://gerrit.openafs.org/5215
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>