Rework humanTimeUnit() formats of meters #4727

Job	Run time
build-freebsd-latest-clang	1m 57s
build-netbsd-latest-gcc	2m 37s
build-macos-latest-clang	47s
build-dragonflybsd-latest-gcc	2m 16s
build-openbsd-latest-clang	2m 30s
build-solaris-latest-gcc	3m 28s
build-ubuntu-latest-clang-analyzer	1m 21s
build-ubuntu-latest-clang-sanitizer	1m 12s
build-ubuntu-latest-full-featured-clang	1m 9s
build-ubuntu-latest-full-featured-gcc	55s
build-ubuntu-latest-gcc-static	50s
build-ubuntu-latest-minimal-clang	1m 8s
build-ubuntu-latest-minimal-gcc	36s
build-ubuntu-latest-pcp	25s
lint-pcp-config	4s
lint-whitespace	2s
	21m 17s

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