Windows: adjust scache LRU postion upon deletion

Windows: adjust scache LRU postion upon deletion

If the object represented by a scache object is deleted,
update the LRU position of the scache object to make it
the first object in the LRU queue to be recycled.  This
preserves the cached objects for those that might prove
useful in the future.

Reviewed-on: http://gerrit.openafs.org/5161
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit c5126838590eaf15e0df569c31b2a1bc12b3e0af)

Change-Id: Icf60ad3127c295e4fca0e99e338ba4c62cd9e392
Reviewed-on: http://gerrit.openafs.org/5210
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>