bug#43152: 28.0.50; when building emacs 28.0.50 ./temacs is stopped with core

[Lars Ingebrigtsen]

And, indeed, doing the same on the current master makes the segfault go
away and gives me a working Emacs on high sierra:

In GNU Emacs 28.0.50 (build 6, x86_64-apple-darwin17.7.0, NS appkit-1561.60 
Version 10.13.6 (Build 17G2208))
 of 2020-09-05 built on high-sierra.local
Repository revision: 585fe00557489e49188b6a301f001ef01ff15dcb
Repository branch: master
System Description:  Mac OS X 10.13.6


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   bloggy blog: http://lars.ingebrigtsen.no