[SCM] GNU M4 source repository annotated tag, v1.4.18, created. v1.4.18

[Eric Blake]

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http://git.sv.gnu.org/gitweb/?p=m4.git;a=commitdiff;h=3ac47cb6e63e2be9f5afade6865b95886d12ca2d

The annotated tag, v1.4.18 has been created
        at  3ac47cb6e63e2be9f5afade6865b95886d12ca2d (tag)
   tagging  9ee883e1bf1160b2733e7fb4b3efc4af86562653 (commit)
  replaces  v1.4.17
 tagged by  Eric Blake
        on  Sat Dec 31 16:35:51 2016 -0600

- Log -----------------------------------------------------------------
m4 1.4.18
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Eric Blake (16):
      build: improve default build for non-gcc
      build: fix regression for DragonFly BSD
      maint: bump copyright year
      doc: fix line-wrapped macro definitions
      gnulib: Update to latest
      maint: bump copyright year
      maint: regenerate bootstrap
      build: update to latest gnulib
      doc: drop obsolete @setcontentsaftertitlepage
      maint: release no longer creates a diff file
      maint: make silent builds the default
      maint: summarize highlights of pending release
      maint: generate ChangeLog from git commits
      maint: automate creation of release tag
      doc: abbreviate and update release history
      version 1.4.18

Gary V. Vaughan (3):
      maint: post-release administrivia
      maint: update HACKING release instructions.
      bootstrap: sync with upstream.

KO Myung-Hun (3):
      configury: append $EXEEXT suffix to /bin/sh.
      configury: add -Zargs-resp to LDFLAGS on OS/2.
      m4: fdopen() with a text mode explicitly on OS/2.

Vitezslav Crhonek (1):
      main: diagnose unsupported --word-regexp

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