[PATCH v2] nss: remove undefined behavior and optimize getaddrinfo

[DJ Delorie]

Collin Funk <collin.funk1@gmail.com> writes:
> Going by NEWS entries, it was added in glibc 2.39 [1].
>
> Booting the Debian GNU/Hurd image that I have,
> debian-hurd-amd64-20250316.img.tar.xz [2]:
>
>     $ ldd --version | sed 1q
>     ldd (Debian GLIBC 2.41-5~0) 2.41

FWIW RHEL 9 doesn't have stdbit.h, even with gcc toolset 14.

Fedora 40 has glibc 2.39, and F40 is the oldest supported Fedora.