Merge pull request #820 from sdarwin/circle6 #29

Job	Run time
b2-windows (windows-2019)	44m 56s
b2-windows (windows-2022)	48m 29s
cmake-install-windows (windows-2019)	14m 17s
cmake-install-posix (ubuntu-20.04)	3m 27s
cmake-install-windows (windows-2022)	13m 34s
cmake-install-posix (ubuntu-22.04)	8m 11s
b2-posix (ubuntu-20.04)	14m 38s
cmake-test-posix (ubuntu-20.04)	28m 2s
cmake-install-posix (macos-11)	7m 36s
b2-posix (ubuntu-22.04)	14m 53s
cmake-test-posix (ubuntu-22.04)	36m 32s
cmake-install-posix (macos-12)	6m 34s
b2-posix (macos-11)	26m 32s
cmake-install-posix (macos-13)	12m 20s
b2-posix (macos-12)	26m 22s
cmake-test-posix (macos-11)	35m 13s
b2-posix (macos-13)	20m 55s
cmake-test-posix (macos-12)	35m 27s
cmake-test-posix (macos-13)	27m 23s
cmake-test-windows (windows-2019)	34m 25s
cmake-test-windows (windows-2022)	41m 16s
	8h 21m 2s

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