no ipv6 support

[joeyh]

I see it uses AF_INET with no AF_INET6, and there are probably other problems also preventing ipv6 addresses from being used to multicast. When I naively tried feeding it "ff02::1" for the address, I got back an error message:

sender.hs: user error (inet_addr: Malformed address: ff02::1)

[lanodan]

Would be nice to resolve… Specially as IPv4 has no addresses available on the RIPE since 2012 and it’s not going to have more without the switch to IPv6. (or a very ugly double-NAT)

[audreyt]

Hi — thanks for resurfacing this issue! Sorry I haven't got a round tuit on this, but I'll gladly merge a pull request and re-publish.