darwin: nanoseconds to centi-seconds #1554

Job	Run time
build-freebsd-latest-clang	6m 14s
build-netbsd-latest-gcc	3m 4s
build-dragonflybsd-latest-gcc	6m 34s
build-macos-latest-clang	49s
build-openbsd-latest-clang	6m 26s
build-ubuntu-latest-clang-analyzer	1m 25s
build-solaris-latest-gcc	4m 4s
build-ubuntu-latest-clang-sanitizer	2m 13s
build-ubuntu-latest-full-featured-clang	2m 49s
build-ubuntu-latest-full-featured-gcc	49s
build-ubuntu-latest-gcc-static	47s
build-ubuntu-latest-minimal-clang	1m 53s
build-ubuntu-latest-minimal-gcc	37s
build-ubuntu-latest-pcp	24s
lint-pcp-config	3s
lint-whitespace	2s
	38m 13s

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