auditdistd: Avoid calling deprecated OpenSSL functions

As of OpenSSL 1.1 SSL_library_init() and SSL_load_error_strings() are
deprecated. There are replacement initialization functions but they do
not need to be called: "As of version 1.1.0 OpenSSL will automatically
allocate all resources that it needs so no explicit initialisation is
required."

Wrap both calls in an OPENSSL_VERSION_NUMBER block.

Upstream pull request submitted at
https://github.com/openbsm/openbsm/pull/82

PR: 271615
Reviewed by: ngie
Event: Kitchener-Waterloo Hackathon 202305
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D40273

Fixup some incorrect information and some comments. These changes
were cherry picked up the upstream OpenBSD repository. At some point we
will look at doing another import, but the diffs are substantial and will
require some careful testing.

Differential Revision: https://reviews.freebsd.org/D25021
MFC after: 2 weeks
Submitted by: gbe
Reviewed by: myself, bcr

Make auditdistd(8) buildable.