Package libsmbclient-devel: Information

- Add support samba-tool-plus alternative for samba-dc build with heimdal.

- Update to latest security release of Samba 4.14
- Security fixes:
  + CVE-2016-2124:  SMB1 client connections can be downgraded to plaintext
                    authentication.
                    https://www.samba.org/samba/security/CVE-2016-2124.html
  + CVE-2020-25717: A user on the domain can become root on domain members.
                    https://www.samba.org/samba/security/CVE-2020-25717.html
  + CVE-2020-25718: Samba AD DC did not correctly sandbox Kerberos tickets
                    issued by an RODC.
                    https://www.samba.org/samba/security/CVE-2020-25718.html
  + CVE-2020-25719: Samba AD DC did not always rely on the SID and PAC in
                    Kerberos tickets.
                    https://www.samba.org/samba/security/CVE-2020-25719.html
  + CVE-2020-25721: Kerberos acceptors need easy access to stable AD identifiers
                    (eg objectSid).
                    https://www.samba.org/samba/security/CVE-2020-25721.html
  + CVE-2020-25722: Samba AD DC did not do suffienct access and conformance
                    checking of data stored.
                    https://www.samba.org/samba/security/CVE-2020-25722.html
  + CVE-2021-3738:  Use after free in Samba AD DC RPC server.
                    https://www.samba.org/samba/security/CVE-2021-3738.html
  + CVE-2021-23192: Subsequent DCE/RPC fragment injection vulnerability.
                    https://www.samba.org/samba/security/CVE-2021-23192.html

- Rebuild with updated ldb-2.3.2 with backported all C code changes from
  ldb-2.4.1 to be available for Samba 4.14.x.