Minor changes in the macOS build system #2143

Job	Run time
Make SDist	20s
build (ubuntu-24.04-arm, manylinux, aarch64)	2h 34m 1s
build (ubuntu-latest, musllinux, musllinux)	18m 20s
build (macos-14, macosx, macos_arm64, arm64)	2h 2m 14s
build (ubuntu-latest, manylinux, manylinux)	1h 50m 53s
build (macos-15-intel, macosx, macos_x86_64, x86_64)	29m 42s
upload_to_test_pypy	28s
upload_to_pypi	0s
	7h 15m 58s

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