Errors compiling bro-pub-0.8a32 on Linux 2.4.20-8

There must be a better way of using res_mkquery to assure that this
calls in the nb_dns.c will work s expected.

I've asked Craig Leres (who wrote the nb_dns stuff, and is one of
Bro's autoconf maintainers) to look into this.

I do note that nb_dns.h does
not even exist on my Linux box

That's a Bro source file rather than a system file, so checking for it
won't help.