Update variant2 from develop #2840

Job	Run time
b2-windows (windows-2019)	27m 48s
b2-posix (ubuntu-20.04)	13m 17s
b2-windows (windows-2022)	29m 30s
cmake-install-posix (ubuntu-20.04)	4m 10s
b2-posix (ubuntu-22.04)	13m 0s
cmake-install-windows (windows-2019)	8m 35s
cmake-install-posix (ubuntu-22.04)	4m 17s
b2-posix (ubuntu-24.04)	13m 41s
cmake-install-posix (ubuntu-24.04)	6m 4s
cmake-test-posix (ubuntu-latest)	31m 41s
cmake-install-windows (windows-2022)	8m 21s
b2-posix (macos-13)	33m 19s
cmake-install-posix (macos-13)	9m 28s
cmake-install-posix (macos-14)	4m 17s
b2-posix (macos-14)	10m 16s
cmake-install-posix (macos-15)	5m 37s
b2-posix (macos-15)	11m 19s
cmake-test-posix-quick (ubuntu-20.04)	1m 44s
cmake-test-posix-quick (ubuntu-22.04)	2m 57s
cmake-test-windows-quick (windows-2019)	5m 52s
cmake-test-posix-quick (ubuntu-24.04)	1m 53s
cmake-test-windows-quick (windows-2022)	5m 8s
cmake-test-posix-quick (macos-13)	5m 55s
cmake-test-posix-quick (macos-14)	3m 53s
cmake-test-posix-quick (macos-15)	4m 31s
	4h 26m 33s

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