We will use this in mapping 64-bit directory offset
cookies to a 32-bit counter.
https://bugzilla.samba.org/show_bug.cgi?id=2662
Signed-off-by: Jeremy Allison <jra@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit 4e0c41a321b2683610748c8c176fc46aaa8d114d)