make stat64 and pals work on UW7

[John Hughes]

> This needs a patch to aclocal.m4, on UW7 stat64 is found in
> sys/stat.h, not asm/stat.h but I suppose that'll be a problem
> for Linux?

Oh, I've just seen the solaris patch from Harald Böhme.  It looks
like it never got merged?

It looks like it could do some good things for UW7.

--
John Hughes <john at Calva.COM>,
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