Log Message:
gsed: update to 4.5.

* Noteworthy changes in release 4.5 (2018-03-31) [stable]

** Bug fixes

  sed now fails when matching very long input lines (>2GB).
  Before, sed would silently ignore the regex without indicating an
  error. [Bug present at least since sed-3.02]

  sed no longer rejects comments and closing braces after y/// commands.
  [Bug existed at least since sed-3.02]

  sed -E --posix no longer ignores special meaning of '+','?','|' .
  [Bug introduced in the original implementation of --posix option in
  v4.1a-5-gba68fb4]

  sed -i now creates selinux context based on the context of the symlink
  instead of the symlink target. [Bug present since at least sed-4.2]
  sed -i --follow-symlinks remains unchanged.

  sed now treats the sequence '\x5c' (ASCII 92, backslash) as literal
  backslash character, not as an escape prefix character.
  [Bug present since sed-3.02.80]
  Old behavior:
     $ echo z | sed -E 's/(z)/\x5c1/' # identical to 's/(z)/\1/'
     z
  New behavior:
     $ echo z | sed -E 's/(z)/\x5c1/'
     \1