make getaddrinfo with AF_UNSPEC and null host return both IPv4 and v6
authorRich Felker <dalias@aerifal.cx>
Wed, 24 Jul 2013 20:49:17 +0000 (16:49 -0400)
committerRich Felker <dalias@aerifal.cx>
Wed, 24 Jul 2013 20:49:17 +0000 (16:49 -0400)
based on a patch by orc, with indexing and flow control cleaned up a
little bit. this code is all going to be replaced at some point in the
near future.


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