IPv6 Link local addresses not supported.

[Achuta <coolbuddy goowy com>]

Hi,

GLib/GIO cannot listen on IPv6 link local address. This bug is because
GSocketAddress does not have a field for "sin6_scope_id" to fill in interface
index (as stated in `man 7 ipv6`).

I would like to make the changes. Is there some manual/procedures on code contribution and submission?

Regards,
Vijay