Windows: lock protected fields must be 32-bit

Windows: lock protected fields must be 32-bit

It is not safe to protect two 16-bit fields in a structure
with different locks.  Switch to using 32-bit fields.

Increment the cm-memmap version number since the data structure
sizes changed and the cache file must be invalidated.

Change-Id: I867b4b85b4fd9fe0083ad9d0559311f1c287513f
Reviewed-on: http://gerrit.openafs.org/4660
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>