bug#32746: setitimer API is obsolescent

[Paul Eggert]

Eli Zaretskii wrote:

> However, I think it might be too early to remove support for
> setitimer, because some platforms have problems with it.  AFAIK, macOS
> and some *BSD version either don't have that family or have buggy
> implementations.

In that case never mind about removing use of setitimer. I'm attaching a patch 
against my previous proposal for fixup on the MS-Windows side, in the light of 
your other comments; good luck with it, and feel free to ignore the whole thing 
if it doesn't work. As before, it's untested and no doubt it has problems.

0001-Patch-inspired-by-Eli-s-review-Bug-32764-10.patch
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