linux

Suppress clang-19 warning when building tests with C++17. Add clang-19 in CI. #1612

Job	Run time
build (g++-8, Debug, 17, ubuntu-20.04, ON)	6m 14s
build (g++-8, Release, 17, ubuntu-20.04, ON)	8m 22s
build (g++-10, Debug, 17, ubuntu-20.04, ON)	6m 23s
build (g++-10, Release, 17, ubuntu-20.04, ON)	9m 30s
build (g++-13, Release, 23, ubuntu-20.04, ON, sudo apt -o Acquire::Retries=5 install g++-13)	14m 13s
build (g++-13, Debug, 23, ubuntu-20.04, ON, sudo apt -o Acquire::Retries=5 install g++-13)	9m 47s
build (g++-10, Release, 17, ubuntu-20.04, OFF, -DQUILL_NO_EXCEPTIONS=ON -DQUILL_BUILD_TESTS=ON)	1m 34s
build (g++-10, Release, 20, ubuntu-20.04, ON, -DQUILL_USE_VALGRIND=ON, -T memcheck, sudo apt -o A...	18m 35s
build (clang++-12, Release, 20, ubuntu-20.04, ON, -DQUILL_SANITIZE_ADDRESS=ON)	21m 31s
build (clang++-12, Release, 20, ubuntu-20.04, ON, -DQUILL_SANITIZE_THREAD=ON)	16m 7s
build (clang++-19, Release, 17, ubuntu-20.04, ON, wget -O - https://apt.llvm.org/llvm-snapshot.gp...	1m 29s
	1h 53m 45s

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