linux

Suppress clang-19 warning when building tests with C++17. Add clang-19 in CI. #1613

Job	Run time
build (g++-8, Debug, 17, ubuntu-20.04, ON)	18s
build (g++-8, Release, 17, ubuntu-20.04, ON)	23s
build (g++-10, Debug, 17, ubuntu-20.04, ON)	14s
build (g++-10, Release, 17, ubuntu-20.04, ON)	11s
build (g++-13, Release, 23, ubuntu-20.04, ON, sudo apt -o Acquire::Retries=5 install g++-13)	3m 5s
build (g++-13, Debug, 23, ubuntu-20.04, ON, sudo apt -o Acquire::Retries=5 install g++-13)	4m 39s
build (g++-10, Release, 17, ubuntu-20.04, OFF, -DQUILL_NO_EXCEPTIONS=ON -DQUILL_BUILD_TESTS=ON)	1m 37s
build (g++-10, Release, 20, ubuntu-20.04, ON, -DQUILL_USE_VALGRIND=ON, -T memcheck, sudo apt -o A...	24s
build (clang++-12, Release, 20, ubuntu-20.04, ON, -DQUILL_SANITIZE_ADDRESS=ON)	20s
build (clang++-12, Release, 20, ubuntu-20.04, ON, -DQUILL_SANITIZE_THREAD=ON)	15s
build (clang++-19, Release, 17, ubuntu-20.04, ON, wget -O - https://apt.llvm.org/llvm-snapshot.gp...	33s
	11m 59s

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