do not check ip_mtudisc on IPv6 TCP. with IPv6 TCP PMTUD is mandatory, compute mss size accordingly. sync with kame
do not check ip_mtudisc on IPv6 TCP.
with IPv6 TCP PMTUD is mandatory, compute mss size accordingly.
sync with kame

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars