Merge pull request #157 from boostorg/develop #436

Job	Run time
B2 msvc-14.2	5m 7s
CMake msvc-14.2 Debug C++17	5m 35s
B2 msvc-14.3	6m 16s
CMake gcc-11 17 Debug	8m 37s
CMake msvc-14.2 Release C++17	7m 51s
B2 gcc-11	2m 54s
CMake gcc-11 20 Release	7m 0s
CMake msvc-14.3 Debug C++20	6m 58s
B2 clang-14	2m 33s
CMake clang-11 17 Debug	1m 9s
CMake msvc-14.3 Release C++20	6m 21s
CMake clang-11 20 Debug	1m 2s
CMake clang-13 17 Release	1m 12s
CMake clang-13 20 Release	1m 0s
CMake clang-14 17 Debug -stdlib=libc++	9m 6s
CMake clang-14 20 Release -stdlib=libc++	8m 20s
	1h 21m 1s

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