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Ryan Tandy authored Dec 19, 2019 and Quanah Gibson-Mount committed Jan 09, 2020

This reverts commits a956f759 ("Add (not
yet used) ICU detection") and 1cf5838e
("detect ICU and link it into slapd(8)").

This commits deletes all references and code for back-bdb and back-hdb.
There is some follow up work still necessary to flush out the admin
guide for back-mdb.

Comment in the code referenced Referential Integrity overlay instead of
the Return Code overlay.

Bryan Duncan authored Nov 14, 2011 and Quanah Gibson-Mount committed Oct 19, 2017

Patch obtained from:
        http://public.me.com/bryan.duncan/bryan-duncan.kqueue.090922.patch

 # This patch file is derived from OpenLDAP Software. All of the
 # modifications to OpenLDAP Software represented in the following
 # patch(es) were developed by Apple.  I, Bryan Duncan, am authorized by
 # Apple, my employer, to release this work under the following terms.
 #
 # Copyright 2009 Apple Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted only as authorized by the OpenLDAP
 # Public License.
 #
 # A copy of this license is available in file LICENSE in the
 # top-level directory of the distribution or, alternatively, at
 # http://www.OpenLDAP.org/license.html.
 #

Does not update the tests themselves.

In configure --help, call it "mdb database backend" instead of something
with "memory-mapped" which could confuse somebody about a memory-only DB.

Conflicts:

	servers/slapd/back-mdb/Makefile.in

add support for (experimental) dereference control (ITS#5768); need to re-run autoconf (and autoheader?)