[platform-testers] new snapshot available: grep-3.1.51-e767

[Jim Meyering]

This includes numerous build and test fixes both here and via gnulib:

grep snapshot:
  https://meyering.net/grep/grep-ss.tar.xz      1.5 MB
  https://meyering.net/grep/grep-ss.tar.xz.sig
  https://meyering.net/grep/grep-3.1.51-e767.tar.xz

Changes in grep since 3.1.48-7eea:

Bruno Haible (1):
      tests: stackoverflow: fix test failure on HardenedBSD 11

Jim Meyering (1):
      tests: remove stale surrogate-pair test

Paul Eggert (1):
      build: update gnulib submodule to latest


Changes in gnulib since 3.1.48-7eea:

* gnulib 01aa713...a00bedc (7):
  > autoupdate
  > random: Fix build error on native Windows (regression from 2018-06-21).
  > autoupdate
  > obstack, libc-config: Support HP-UX cc in C99 mode.
  > localename: Fix test failure on OpenBSD >= 6.2.
  > duplocale tests: Re-enable the test on platforms without <monetary.h>.
  > localename: Update comments.