Windows: cm_SymLink export created cm_scache_t

Windows: cm_SymLink export created cm_scache_t

Permit the caller to request the cm_scache_t that represents
the created symlink or mount point object.

Reviewed-on: http://gerrit.openafs.org/5355
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 9b0cb614387403ff433cf39f84c13b626b1b9bdc)

Change-Id: I170059255e3bbc7e3ccbd59b66d7d8b11005a94f
Reviewed-on: http://gerrit.openafs.org/6031
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>