Add OpenSSL 3.0 to mingw build

Add OpenSSL 3.0 to mingw build

This also updates the host system to ubuntu 22.04 and remove the
ovpn-dco-win checkout as we now include the required headers in
our own repository.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Patch v2: rebase

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20220826153026.337899-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25131.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>