bug#17258: autogen.sh doesn't update stale autoconf files in build-aux

[Achim Gratz]

While troubleshooting a problem with configure on my system, I found
that autogen.sh never updated these autoconf files in build-aux, so they
were still the same as when they had been generated/copied three years
ago:

build-aux/compile
build-aux/config.guess
build-aux/config.sub
build-aux/install-sh
build-aux/missing
build-aux/depcomp

Apparently these files are just checked for existence unless the
"--force" option is also given (which autogen.sh doesn't do).  I'm
currently using autoconf 2.69 if that matters.


Regards,
Achim.
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