[InterNetNews/inn] 9e9e0c: Fix build with LibreSSL

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 9e9e0cb9c613c091d39edbfc2191fc001353f045
      https://github.com/InterNetNews/inn/commit/9e9e0cb9c613c091d39edbfc2191fc001353f045
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2021-12-05 (Sun, 05 Dec 2021)

  Changed paths:
    M nnrpd/tls.c

  Log Message:
  -----------
  Fix build with LibreSSL

LibreSSL is not API-compatible with OpenSSL versions > 1.0.1.
So we just do not use new OpenSSL APIs with it.