lwres_gabn(3) on macOS

The text 2a1adbe23338, 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 getaddrbyname message handling

lwres_gabn(3) on macOS now