Windows: Report Case Sensitive Search

Return the FILE_CASE_SENSITIVE_SEARCH volume flag as part of afs
volume properties.   NTFS does and our search algorithm is case
sensitive first, then case insensitive.

Reviewed-on: http://gerrit.openafs.org/9850
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 5ae397146a8b33eb924f6a3420e2247f1986b1ad)

Change-Id: Ie56203766afa9d6a98bfdffba8f2a869b937ea76
Reviewed-on: http://gerrit.openafs.org/9851
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>