posix

Merge pull request #128 from mattip/patch-external #137

Job	Run time
build (ubuntu-latest, i686, 0, 2014)	11m 15s
build (ubuntu-latest, x86_64, 0, 2014)	13m 0s
build (ubuntu-latest, x86_64, 1, 2014)	13m 38s
build (macos-11, x86_64, 0, 2014)	33m 48s
build (macos-11, x86_64, 1, 2014)	31m 51s
build (macos-11, arm64, 1)	21m 33s
build (macos-11, arm64, 0)	21m 30s
build (ubuntu-latest, x86_64, 1, _1_1, musllinux)	14m 39s
build (ubuntu-latest, x86_64, 0, _1_1, musllinux)	14m 31s
	2h 55m 45s

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