fix support for TH_ECN. use u_int16_t, instead of u_short, for port #.
fix support for TH_ECN.
use u_int16_t, instead of u_short, for port #.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame