Log Message:
samba4: updated to 4.20.4

Changes since 4.20.3
--------------------

This only fixes a regression in library version strings in Samba
4.20.3, see: https://bugzilla.samba.org/show_bug.cgi?id=15673

If you compiled Samba from the sources and don't have other
applications relying on Samba's public libraries, there's
no reason to upgrade from 4.20.3 to 4.20.4.

o  Andreas Schneider <asn@samba.org>
   * BUG 15673: --version-* options are still not ergonomic, and they reject
     tilde characters.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 15673: --version-* options are still not ergonomic, and they reject
     tilde characters.