Trying alternate macOS config for openmp #621

Job	Run time
ci (macos, macos-latest, yes)	1m 51s
ci (macos, macos-latest, no)	1m 47s
ci (container, ubuntu-latest, rocker/r2u4ci)	3m 34s
ci (macos, macos-latest, alt)	1m 59s
	9m 11s

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