[tin-bugs] C99 compatibility fixes for the configure script

[Florian Weimer]

* Florian Weimer:

> We are trying to get Fedora ready for building with a future GCC version
> which rejects certain language features that were removed in 1999:
>
>   <https://fedoraproject.org/wiki/Changes/PortingToModernC>
>   <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
>
> The configure script needs a few changes to avoid triggering implicit
> function declarations.
>
> The attached patch is relative to tin 2.6.1.

GCC 14 plans changed, and we are now carrying further changes for tin
2.6.2 in Fedora.  I'm attaching our current patch.

Thanks,
Florian
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