Suppress clang-19 warning when building tests with C++17. Add clang-1… #1607

Job	Run time
mingw (mingw64, Release, 17, ON)	15m 20s
msvc (windows-2022, x64, Debug, 17, ON)	6m 48s
mingw (ucrt64, Release, 17, ON)	16m 38s
msvc (windows-2022, x64, Debug, 20, ON)	10m 13s
msvc (windows-2022, x64, Release, 17, ON)	17m 11s
msvc (windows-2022, x64, Release, 20, ON)	21m 4s
msvc (windows-2022, x64, Release, 17, OFF, -DQUILL_NO_EXCEPTIONS=ON -DQUILL_BUILD_TESTS=ON)	3m 7s
msvc (windows-2022, ARM64, Release, 17, OFF)	3m 22s
	1h 33m 43s

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