www/nginx: Merge Options KTLS from www/nginx-devel:

New kernel TLS feature is available starting with FreeBSD 13.0,
    and it requires OpenSSL 3.0, compiled with "enable-ktls" option.
    Further, KTLS needs to be enabled in kernel, and in OpenSSL,
    either via OpenSSL configuration file or with

      ssl_conf_command Options KTLS;

    in nginx configuration.

    To enable kernel TLS on FreeBSD 13 and above:

      # kldload ktls_ocf
      # sysctl kern.ipc.tls.enable=1

    to load a software backend, see man ktls(4) for details.

    Also, please visit the following link to get more details
    https://hg.nginx.org/nginx/rev/65946a191197

Obtained from: https://cgit.freebsd.org/ports/commit/?id=62502a50558bbc0950693a9ea52aee738a80f0c8
Sponsored by:	Netzkommune GmbH