gnupg 1.2.2: IPv6 support

[itojun at iijlab.net]

>> 	the following diff should add IPv6 support (keyserver access)
>> 	to gnupg 1.2.2.
>> 	config.h.in should be automatically generated, however, i'm not too
>> 	familiar with automake so i hand-patched it.  please consider
>> 	integrating it into future distribution.
>I am planning to add IPv6 support to the next devel branch release of
>GnuPG (1.3.x).  Unfortunately, I can't fully test it here.  Would you
>(or anyone reading this) be willing to test?

	of course, i'm very happy to test.

itojun