cleanup in ip6_ctloutput; centralized macro definitions for NRL-derived systems to share the code.
cleanup in ip6_ctloutput; centralized macro definitions for NRL-derived
systems to share the code.

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