Fix bug 8153 found when building on an IPv6-only system by Kai Blin.
When building on IPv6-only, doing:
hints.ai_family = AF_INET;
getaddrinfo("0.0.0.0", NULL, &hints, &ppres)
fails as AF_INET is unavailable on an IPv6-only system. This
causes us to fallback to our replacement getaddrinfo code
which is IPv4-only.
As we're only trying to detect a specific AIX bug here,
broaden the tests to find that bug, and also test for
working getaddrinfo in an IPv6-only safe way.
(cherry picked from commit
85468960ebdb3d813bd863e57f6dca6bab61bec2)