[krbdev.mit.edu #1392] getaddrinfo wrapper not good enough on AIX

[Ken Raeburn via RT]

Oh yes... my initial investigation also showed that AIX 4.3.3
getaddrinfo may not return all the IPv6 addresses available for the
supplied hostname.  At least in the case of raeburn.org, which has two
IPv6 addresses, it returned only one, while nslookup on the same machine
showed both.

As with the similar problem on Linux, don't bother trying to fix it,
just make a prominent note of it in the code, and move on....  (Maybe
ask someone with a newer release to see if the problem still exists?)