[tz] Windows build failures

[Paul Eggert]

On 12/20/22 01:42, Manuela Friedrich wrote:
> So I wonder if you can decouple the new condition to set restrict to empty as it is causing the windows issues.

Sure, I installed the attached; please give it a try.

What this means is that when we eventually remove the PORT_TO_C89 code 
(because we no longer need to worry about porting to C89 in general), 
we'll still need to keep this "#define restrict /*empty*/" bit to be 
used only with Visual Studio, as a last little vestige of C89.

Not that I'm a big fan of "restrict". All things considered I'm more in 
the camp of Dennis Ritchie, who famously wrote, "Noalias must go. This 
is non-negotiable." <https://www.lysator.liu.se/c/dmr-on-noalias.html> 
Although Ritchie won that battle in C89, eventually he lost the war, as 
C99's "restrict" is essentially "noalias" by another name.
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