Rok Papež, ARNES 59b8f4ff84 ipv6 loopbacks fix for GNU libc getaddrinfo()
On any OS with a properly implemented getaddrinfo() this change is a
no-op. Passing NULL for the hint is supposed to be the same as an
addrinfo structure with all fields set to 0. There is no need to set
ai_family to AF_UNSPEC because that value is already 0.

GNU libc doesn't follow standard behaviour. Quoting from
http://man7.org/linux/man-pages/man3/getaddrinfo.3.html :

  "Specifying hints as NULL is equivalent to setting ai_socktype and
  ai_protocol to 0; ai_family to AF_UNSPEC; and ai_flags to
  (AI_V4MAPPED | AI_ADDRCONFIG). (POSIX specifies different defaults for
  ai_flags; see NOTES.)"

The NOTES section says:

  "According to POSIX.1-2001, specifying hints as NULL should cause
  ai_flags to be assumed as 0. The GNU C library instead assumes a value
  of (AI_V4MAPPED | AI_ADDRCONFIG) for this case, since this value is
  considered an improvement on the specification."

The patch makes sure that krb5_parse_address works consistently on both
GNU libc and systems that follow POSIX.1-2001 to the letter. Some
incorrect Fedora 17 patches managed to break IPv6 connectivity and were
later backed out (see discussion at https://bugzilla.redhat.com/808147).
This patch resolves the incompatibility.

Signed-off-by: Ken Dreyer <ktdreyer@ktdreyer.com>
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Heimdal is a Kerberos 5 implementation.

For information how to install see <http://www.h5l.org/compile.html>.

There are briefer man pages for most of the commands.

Bug reports and bugs are appreciated, see more under Bug reports in
the manual on how we prefer them: <heimdal-bugs@h5l.org>.

For more information see the web-page at
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