Fixing CI for older clang #467

Job	Run time
Linux GCC 6 Debug (C++14)	37s
Linux GCC 6 Release (C++14)	49s
Linux GCC 6 Debug (C++17)	39s
Linux GCC 6 Release (C++17)	45s
Linux GCC 6 Release (C++17, Concepts)	26s
Linux GCC 7 Debug (C++14)	37s
Linux GCC 7 Release (C++14)	50s
Linux GCC 7 Debug (C++17)	48s
Linux GCC 7 Release (C++17)	39s
Linux GCC 7 Release (C++17, Concepts)	40s
Linux GCC 8 Debug (C++14)	35s
Linux GCC 8 Release (C++14)	45s
Linux GCC 8 Debug (C++17)	43s
Linux GCC 8 Release (C++17)	42s
Linux GCC 8 Release (C++17, Concepts)	26s
Linux GCC 9 Debug (C++17)	7m 24s
Linux GCC 9 Release (C++17)	16m 30s
Linux GCC 9 Debug (C++20)	6m 59s
Linux GCC 9 Release (C++20)	14m 8s
Linux GCC 9 Release (C++20, Concepts)	10m 27s
Linux GCC 10 Debug (C++20, Concepts)	16m 29s
Linux GCC 10 Release (C++20, Concepts)	27m 6s
Linux Clang 5.0 Debug (C++14 / libc++ / ASAN)	38s
Linux Clang 5.0 Debug (C++17 / ASAN)	46s
Linux Clang 6.0 Debug (C++14 / libc++ / ASAN)	45s
Linux Clang 6.0 Debug (C++17 / ASAN)	41s
Linux Clang 8 Debug (C++14 / libc++ / ASAN)	7s
Linux Clang 8 Debug (C++17 / ASAN)	16s
Linux Clang 9 Debug (C++17 / ASAN)	20s
Linux Clang 9 Release (C++17)	10s
Linux Clang 10 Debug (C++20 / ASAN)	7s
Linux Clang 10 Release (C++20 / Concepts)	7s
macOS Clang Debug (C++17)	10m 55s
macOS Clang Release (C++17)	12m 37s
macOS Clang Debug (C++20 / ASAN)	10m 7s
macOS Clang Release (C++20)	12m 4s
Windows MSVC 2022 Debug (C++17)	9m 29s
Windows MSVC 2022 Release (C++17)	14m 11s
Windows MSVC 2022 Debug (C++20)	9m 40s
Windows MSVC 2022 Release (C++20)	13m 43s
	3h 25m 47s

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