Restore test coverage on macOS #395

Job	Run time
Build (clang-18/bmake on ubuntu-22.04)	27s
Build (gcc-14/make on ubuntu-24.04)	1m 41s
Build (gcc-14/bmake on macos-14)	12s
Build (gcc-13/make on macos-13)	21s
Build (clang-18/bsdmake on macos-15)	12s
Build (musl-gcc/bmake on ubuntu-22.04)	50s
	3m 43s

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