fix locale for lint-shell #13851

   5 | @@ -6,6 +6,15 @@
   6 |  #
   7 |  # Check for shellcheck warnings in shell scripts.
   8 |  
   9 | +# The shellcheck binary segfault/coredumps in Travis with LC_ALL=C
  10 | +# It does not do so in Ubuntu 14.04, 16.04, 18.04 in versions 0.3.3, 0.3.7, 0.4.6
  11 | +# respectively. So export LC_ALL=C is set as required by lint-shell-locale.sh

---

  15 | +  unset LC_ALL
  16 | +fi
  17 | +
  18 |  # This script is intentionally locale dependent by not setting "export LC_ALL=C"
  19 |  # to allow running certain versions of shellcheck that core dump when LC_ALL=C
  20 |  # is set.

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