[tz] iana build failures on Windows

[Paul Eggert]

On 2022-11-01 02:04, Manuela Friedrich wrote:

> Your patch works fine. Thank you!
> Can you release a new version with this fix since the 2022f release contains the problematic code and fails to build on Windows?

Thanks for checking. I installed the attached. This should appear in the 
next release.

I hope we don't need a new release urgently merely due to this issue. 
Developers building on MS-Windows can use use GNU Make (via WSL, 
Chocolatey,  MinGW-w64, etc.) and if nmake has a serious issue like this 
one I can't help but wonder whether it has other lurking issues we don't 
know about (plus, 'make check' is buggy even with this patch); so I 
might suggest GNU Make anyway. If there's some reason developers can't 
use GNU Make, they can use the first attached patch in the meantime; 
it's just one line.

There's a good chance we'll need a new tzdb version reasonably soon for 
some more-urgent reason (Paraguay, say), so this is a temporary situation.
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