nnrpd: adding blacklistd support

[Andreas Kempe]

Hello,

FreeBSD ships the software blacklistd, originally from NetBSD, that
allows blocking brute force attacks using the firewall. I've written a
small patch running on Lysator's news server adding support to nnrpd
for automatic blocking.

I'm writing this to probe whether there is any interest in having the
patch upstreamed. In its current form, the blacklist code is
unconditionally added but can of course be put behind an option to the
configure script or a FreeBSD define of some kind.

See the attached file for the patch.

Cordially,
Andreas Kempe
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