lwres_gnba(3) on macOS

The text 1ff7428b04cb, as Mac OS X 10.4.11.x86, Mac OS X 10.4.11.ppc, Mac OS X 10.4.10.x86, Mac OS X 10.4.10.ppc shipped it.

lightweight resolver getnamebyaddress message handling

lwres_gnba(3) on macOS now