[PATCH] maint: fix output for unknown long options for utils without long option

[Bernhard Voelker]

The attached addresses the case when the user passes an invalid
long option to a utility which does not have any long options
(apart from --help/--version, of course).
See commit comment for details.

I saw this when trying to write the check to verify the options
mentioned by usage() versus that actually recognized by getopt_long.

I'm also a bit confused that/why we obviously cannot teach gnulib's
parse_long_options to already diagnose this in the first run, so
that the following getopt_long call would become obsolete?

BTW: How do we mark patches which belong to several tools and
are user-visible, but the list of utilities is quite long?
  cksum dd hostid hostname link logname nohup sleep tsort
  unlink uptime users whoami yes
Probably this warrants a NEW entry?

Comments welcome.

Thanks & have a nice day,
Berny

0001-maint-fix-output-for-unknown-long-options-for-utils-.patch
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