[PATCH] maint: define usage note about mandatory args centrally

[Bernhard Voelker]

Instead of adding the text
  "Mandatory arguments to long options are mandatory
   for short options too."
in every program, define it once in system.h - similar
to emit_size_note() and emit_blocksize_note().

During the replacement, I noticed a few programs which
did not yet emit the above text although they are candidates
for it: they have at least one long option with a mandatory
argument, and a short option for the same purpose.
I added the new function there, too.

Have a nice day,
Berny

usage-mandatory-args.patch
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