check for stale configure much earlier

[Thorsten Glaser]

On Sat, 23 Jul 2022, Darren Tucker wrote:

> +		AC_MSG_WARN([$i newer than configure, running autoreconf])
> +		(cd $srcdir && autoreconf) || AC_MSG_ERROR([autoreconf failed])

I’d rather have it error out here, possibly with a command line flag
to override this. Running autoreconf without the right AUTOCONF_VERSION
and AUTOMAKE_VERSION set is going to be trouble in ports, for example.

bye,
//mirabilos
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