Portable IPv6 support for purple_network_listen

[Paul Aurich]

And Paul Aurich spoke on 04/12/2010 07:50 PM, saying:
>    1) This doesn't currently do anything if HAVE_GETADDRINFO is
> undefined.  I see two paths:
>       a. state that IPv6 isn't supported without GAI and code in a check
> for network_family == AF_INET6 and return NULL or
>       b. add support for it manually.  This may be required because
> WinPidgin Bonjour supports IPv6 (I think), without GAI.  If that's
> incorrect, my preference is (a)

Nevermind.  Daniel says v6 Bonjour on Windows isn't expected to work, so
I'll go with (a) if nobody has other concerns before I get around to
committing it.

> P.S. Daniel, I see one potential issue with IPv6 Bonjour on WinPidgin.
> The socket addr -> string code in jabber.c:_server_socket_handler() will
> fail, because HAVE_INET_NTOP isn't set for WinPidgin (added in Vista :(
> ).  http://www.mail-archive.com/users@ipv6.org/msg02107.html suggests
> WSAAddressToString is deficient, but if we dynamically load getnameinfo
> (available in Win2K), that wrapper function or something similar would work.

Nevermind this, too.

~Paul

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