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On some systems, we don't use our getopt. As a consequence the error
messages vary:
$ bison --skeleton
bison: option requires an argument -- skeleton
Try 'bison --help' for more information.
instead of
bison: option '--skeleton' requires an argument
Try 'bison --help' for more information.
Reported by Jannick and Nelson H. F. Beebe.
https://lists.gnu.org/archive/html/bison-patches/2018-10/msg00140.html
* tests/input.at (Invalid number of arguments): work around getopt
portability issues.