Windows: SetDispositionInfo vs Link Count

When SetDispositionInfo is called to mark a file for pending
delete the link count should not be decrememented.  The count is
decremented only when the file is actually deleted.

Change-Id: I611e2b9695179abcba01d6fa83022b08044ee8bf
Reviewed-on: http://gerrit.openafs.org/11508
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>