Re: GNU m4 CI failure on macOS

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Thanks for reporting that issue in 
<https://lists.gnu.org/r/bug-m4/2026-06/msg00000.html>. Unfortunately I 
didn't notice it until now, as somehow I was not subscribed to bug-m4; 
I've fixed that.

I reproduced something similar on Fedora 44 with clang, and installed 
the attached patch on Savannah on branch-1.4. I hope this fixes the 
macOS issue. The only macOS host on cfarm.net is down, so I can't easily 
test this directly.
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