improve reject routes for IPv4 compat destination.  add more specific routes (like ::224.0.0.0/100) as well.
improve reject routes for IPv4 compat destination.  add more specific
routes (like ::224.0.0.0/100) as well.

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