MFC pf_norm.c rev. 1.17:   Loopback pf_norm.c rev. 1.106 from OpenBSD:       fixup IP checksum when modifying IP header fields
MFC pf_norm.c rev. 1.17:
  Loopback pf_norm.c rev. 1.106 from OpenBSD:
      fixup IP checksum when modifying IP header fields

  PR:			kern/93849
  Obtained from:	OpenBSD

Approved by:	re (kensmith)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase