Ipv6 patch from Laurent Bigonville. When the ipv6 targets are
unreachable, it tries all possible targets from the getaddrinfo list.
Norbert: does it break anything ? it works for me but I didn't test it
extensively
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@99 7dcaeef0-15fb-0310-b436-a5af3365683c
