[HACKERS] pg_regress help output

I have been annoyed at least twice now by the lack of pg_regress command
line help output for the "--bindir=<path>" option. In passing I noted
that there was no output for "--help" or "--version" options either.

Any objections to the attached? It could be argued that it ought to be
back-patched too, but I won't bother unless someone cares enough to
request it.

Joe

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