Windows: EvaluateByName support case-insensitive lookups

Directory lookups in AFS should favor case-sensivite matches
but permit case-insensitive matches otherwise.  The service
should not follow mount points.  The redirector exposes mount
points as junctions.

Change-Id: I34c9244e2756a926f29bbf184dc250e7a29d264f
Reviewed-on: http://gerrit.openafs.org/9132
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>