* openbsd/sys/netinet/tcp_*.c: remove IPv4 mapped support completely   from inbound packet processing.  there were some corner cases not   covered by the code, and it caused SEGV due to inconsistency in   address family.  sync with openbsd-current.
* openbsd/sys/netinet/tcp_*.c: remove IPv4 mapped support completely
  from inbound packet processing.  there were some corner cases not
  covered by the code, and it caused SEGV due to inconsistency in
  address family.  sync with openbsd-current.

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