If a connection fails, try the next address from the getaddrinfo() results.
This should fix issues with hosts that have IPv6 and IPv4 addresses but listen
on only one of them. (Bug #673)
This also fixes a bug that broke error checking in gaim_io_connected(), until
now event handlers were never actually getting proper error reporting (fd=-1),
but IIRC they should all handle it anyway as I was never aware of this bug.
