support additional architectures with autoconf about fox HOT 9 OPEN

I guess maybe #4 is the reason this hasn't been done before :(

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I have a tentative patch that makes FoX compatible with modern autoconf 2.69, at the expense of going back to relying entirely on the autoconf-distributed lang.m4 and fortran.m4, and therefore probably losing compatibility with some old compilers, e.g. ones that cannot do their own source preprocessing.

@andreww is that of interest, or would you rather not break that level of backward compatibility, or have another reason to avoid it?

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Yes - #4 (and my lack of time and fading ability with m4) has been the barrier to this kind of thing.

I think the exchange of the loss of some backward compatibility for a more updatable build system is fair. So yes @bernstei, a patch to update to a modern autoconf would be awesome. I need to merge a bunch of other patches and push out a new version, but I don't think this interacts with with any of that.

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Can this be closed now or is additional work/testing needed?

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Looks like we may also need newer versions of config.sub and/or config.guess. Should I start a new PR for that?

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Yes please. I wonder if it's just a case of using new ones from the autoconf source or if it will need more thought?

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I think this is now fixed on master.

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