[Bug 209387] [exp-run] sed fix.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209387

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: pfg
Date: Wed May 25 15:42:40 UTC 2016
New revision: 300684
URL: https://svnweb.freebsd.org/changeset/base/300684

Log:
  sed: convert sed to use REG_STARTEND more explicitly.

  Summarizing the findings in the OpenBSD list:

  This solves a reproduceable issue with very recent Mesa where REG_NOTBOL
  combined with a match at the begin of the string causes our regex library
  to treat the word as not begin of word.

  Thanks to Martijn van Duren and Ingo Schwarze for taking the time to
  solve this in the least invasive way.

  PR:           209352, 209387
  Taken from:     openbsd-tech (Martijn van Duren)
  MFC after:    1 month

Changes:
  head/usr.bin/sed/process.c

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