Revert last and update comments to make clear which macOS configurati… #22

Job	Run time
build (ubuntu-22.04, g++-12, gcc-12, g++-12)	14m 6s
build (ubuntu-20.04, g++-9, gcc-9, g++-9)	13m 42s
build (ubuntu-22.04, clang-14, clang-14, clang++-14)	11m 56s
build (ubuntu-20.04, clang-9, clang-9, clang++-9, -fno-builtin)	9m 23s
build (macos-15, Xcode_16.0)	8m 19s
build (macos-14, Xcode_16.0)	9m 44s
build (macos-13, Xcode_15.2)	19m 11s
build (macos-13, Xcode_14.3.1)	29m 15s
build (macos-12, Xcode_14.2)	16m 28s
	2h 12m 4s

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