better diagnostics.

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Pointed out by Nick Boyce <nick.boyce@eds.com>.

Submitted by: Andy Polyakov <appro@fy.chalmers.se>

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So far nobody complained...

Submitted by: Anonymous

of Ulf's prototype parser, also general tidying and fixing of several problems
with the original. Its still a bit of a hack but should work.

This is the last bit of the old code that uses the K&R prototypes: after some
testing they can finally go away...

also add a few missing prototypes.

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without producing error messages.
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