bug#79118: CI test failures

[Bruno Haible via GNU coreutils Bug Reports]

Hi Collin,

What if you replace

  setlocale (LC_TIME, "C");

with

  {
    xsetenv ("LC_TIME", "C", 1);
    setlocale (LC_TIME, "");
  }

? I'm asking because in localename-unsafe.c, HAVE_LOCALE_NULL is not set
on macOS. Does that make any difference?

Bruno