Fixes issue 181. #475

Job	Run time
B2 msvc-14.2	5m 45s
B2 gcc-11	3m 33s
B2 msvc-14.3	6m 17s
CMake msvc-14.2 Debug C++17	7m 4s
B2 clang-14	3m 36s
CMake gcc-11 17 Debug	8m 1s
CMake msvc-14.2 Release C++17	7m 12s
CMake gcc-11 20 Release	10m 29s
CMake msvc-14.3 Debug C++20	10m 0s
CMake clang-11 17 Debug	5m 41s
CMake msvc-14.3 Release C++20	10m 6s
CMake clang-11 20 Debug	6m 4s
CMake clang-13 17 Release	8m 12s
CMake clang-13 20 Release	9m 19s
CMake clang-14 17 Debug -stdlib=libc++	7m 50s
CMake clang-14 20 Release -stdlib=libc++	10m 57s
	2h 0m 6s

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