Cleanup. Remove unused function dptr_DirCacheAdd(). Make DirCacheAdd() static.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>

Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Tue Apr 16 12:05:13 CEST 2013 on sn-devel-104