Merge from vendor branch TNF:

Merge from vendor branch TNF:
Import Net-INET6Glue-0.5 as net/p5-Net-INET6Glue:
Net::INET6Glue is a hack to make more of Perl IPv6 able.
This is partly done by replacing IO::Socket::INET with IO::Socket::INET6
and by adding IPv6 Protocol functionality to Net::FTP.
Works for Net::SMTP, LWP, Net::FTP and probably others too.