[InterNetNews/inn] 65daf0: nnrpd: add blacklistd support

[andkem]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 65daf0348223ef22f8d585fbf0798bff4fcff1da
      https://github.com/InterNetNews/inn/commit/65daf0348223ef22f8d585fbf0798bff4fcff1da
  Author: Andreas Kempe <kempe at lysator.liu.se>
  Date:   2022-04-06 (Wed, 06 Apr 2022)

  Changed paths:
    M MANIFEST
    M Makefile.global.in
    M configure.ac
    M doc/pod/install.pod
    M doc/pod/nnrpd.pod
    A m4/blacklist.m4
    M nnrpd/Makefile
    M nnrpd/nnrpd.c
    M nnrpd/nnrpd.h
    M nnrpd/perm.c

  Log Message:
  -----------
  nnrpd: add blacklistd support

Add support to nnrpd for blocking brute force attacks using blacklistd
available on FreeBSD.

New -B flag to nnrpd, and --with-blacklist configure flag.

see #234