osx

Get macOS workflows working again #228

Job	Run time
build_osx_autotools_example	5m 31s
build_osx_autotools_clang	39s
build_osx_cmake	23s
build_osx_autotools_gcc	55s
build_osx_autotools_default_args	6m 13s
build_osx_autotools_other_args	5m 54s
	19m 35s

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