bug#55628: debug-timer-check fails on macOS 11.6.6

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

> Built with enable-checking, (debug-timer-check) returns nil.
> It turns out that debug_timer_callback is never actually called, but I
> haven't dug further than that.
>
> This is on macOS 11.6.6 and HAVE_TIMERFD is not defined. Does this
> code path work on other systems?

I tried this on Debian/bookworm (with nativecomp, but that probably
doesn't make a difference), and I got nil there, too.

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