mac: fix broken selection on intel platform #20

Job	Run time
stylecheck	29s
build-arch (all)	6m 26s
build-arch (dune3d_py.so)	3m 7s
build-nix	7m 37s
build (ubuntu:noble, g++-13, gcc, dune3d_py.so)	2m 58s
build (ubuntu:noble, g++-13, gcc, all)	5m 2s
build (debian:trixie, g++-13, gcc, all)	5m 26s
build (debian:trixie, g++-13, gcc, dune3d_py.so)	3m 2s
build-arch-clang (dune3d_py.so)	3m 22s
build-arch-clang (all)	6m 51s
build-nix-macos	7m 39s
	51m 59s

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