sendmail-8.15.2-8.6.1

- Add upstream patch 8.15.2.mci.p0 (boo#1164084)
  * If sendmail tried to reuse an SMTP session which had already been
    closed by the server, then the connection cache could have invalid
    information about the session.  One possible consequence was that
    STARTTLS was not used even if offered.

- BuildRequire pkgconfig(libsystemd) instead of systemd-devel:
  Allow OBS to shortcut through the -mini flavors.

- Avoid recursion trouble in spec file cause by undefined _lto_cflags

- Add patch sendmail-8.15.2-glibc-2.30.patch
  * The former deprecated macro RES_USE_INET6 is gone with glibc 2.30

- Use FAT LTO objects in order to provide proper static library.

- removal of SuSEfirewall2 service, since SuSEfirewall2 has been replaced by
  firewalld, see [1].
  [1]: https://lists.opensuse.org/opensuse-factory/2019-01/msg00490.html

- Add sendmail-8.15.2-reproducible.patch to make package build reproducible

- Add _FFR_TLS_EC m4 macro definition for site configuration as
  well (boo#1070065)

- Replace references to /var/adm/fillup-templates with new
  %_fillupdir macro (boo#1069468)

- Apply former patches only if openssl 1.1.0+ are installed

- support build with openssl 1.1 (bsc#1067222)
  * add patches from Fedora:
    sendmail-8.15.2-openssl-1.1.0-fix.patch
    sendmail-8.15.2-openssl-1.1.0-ecdhe-fix.patch (rh#1473971)

- Add libnsl-devel build requires for glibc obsoleting libnsl

-  Change requirements for libmilter and sendmail-devel as
  the library is also used by other MTA like postfix (boo#1049188)

- Require user and group mail

- Add bitdomain and uudomain to possible targets for refresh

- Change spec file name scheme used for getting soname down into
  libmilter

-  Remove alias to mail-transfer-agent.target (boo#1116675)

- Replace exec rm by delete/print.

- Remove left over from last patch
- Group daemon is required

- Remove maybe perilous shell script code from sm-client.pre
  (boo#1202937, bsc#1204696, CVE-2022-31256)