is the string "<<none>>" in a header anywhere?

[Jim Meyering <jim@meyering.net>]

Coreutils' install.c currently compares a context against the
magic string, "<<none>>":

  /* If there's an error determining the context, or it has none,
     return to allow default context */
  if ((matchpathcon (file, st.st_mode, &scontext) != 0) ||
      STREQ (scontext, "<<none>>"))
    {
      if (scontext != NULL)
        freecon (scontext);
      return;
    }

BTW, matchpathcon(8) does, too.
Is there a better way to test for that condition?
It'd be nice if that string were available via a libselinux header,
but I don't see it on rawhide:

    $ grep none $(rpm -ql libselinux-devel|grep -F .h)
    [Exit 1]

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