Update openldap to version 2.1.22.

    This release contains the following major enhancements:

        * Transactional backend
        * Improved Unicode handling
        * Improved DN handlng
        * Improved Referral handling
        * SASL authentication/authorization mapping
        * SASL in-directory storage of authentication secrets
        * Enhanced administrative limits/access controls
        * Meta backend (experimental)
        * Monitor backend (experimental)
        * Virtual "glue" backend (experimental)
        * LDAP C++ API
        * Updated LDAP C and TCL APIs
        * LDAPv3 extensions, including:
            - Enhanced Language Tag/Range Support
            - 'Who am i?' Extended Operation
            - 'Matched Values' Control
            - 'NOOP' Control

   plus lots of bug fixes.

Update (to 2.1.20) from Juan RP in PR pkg/21682 with some tidy up and
update to 2.1.22 by Marc Recht and me.

Also closes PR pkg/21217 by Jean-Luc Wasmer and PR pkg/20972 by Jeremy
Reed.

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