Merge pull request #221 from boostorg/develop #546

Job	Run time
B2 msvc-14.2	7m 26s
B2 gcc-11	5m 1s
B2 msvc-14.3	8m 13s
B2 clang-14	5m 39s
CMake gcc-11 17 Debug	8m 58s
CMake msvc-14.2 Debug C++17	6m 18s
CMake gcc-11 20 Release	11m 36s
CMake msvc-14.2 Release C++17	7m 26s
CMake clang-11 17 Debug	6m 20s
CMake msvc-14.3 Debug C++20	8m 16s
CMake clang-11 20 Debug	6m 55s
CMake msvc-14.3 Release C++20	7m 49s
CMake clang-13 17 Release	9m 24s
CMake clang-13 20 Release	9m 53s
CMake clang-14 17 Debug -stdlib=libc++	8m 1s
CMake clang-14 20 Release -stdlib=libc++	12m 9s
	2h 9m 24s

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