[Bug 197484] fix pf 3whs ACK handling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197484

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A commit references this bug:

Author: kp
Date: Sat Oct 20 18:37:22 UTC 2018
New revision: 339470
URL: https://svnweb.freebsd.org/changeset/base/339470

Log:
  pf synproxy will do the 3WHS on behalf of the target machine, and once
  the 3WHS is completed, establish the backend connection. The trigger
  for "3WHS completed" is the reception of the first ACK. However, we
  should not proceed if that ACK also has RST or FIN set.

  PR:           197484
  Obtained from:        OpenBSD
  MFC after:    2 weeks

Changes:
  head/sys/netpfil/pf/pf.c

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