Improve compiler flags #170

Job	Run time
build (clang-debug-cxx17, ninja-clang-debug, build-ninja-clang-debug, test-ninja-clang-debug, 17)	1m 15s
build (clang-debug-cxx20, ninja-clang-debug, build-ninja-clang-debug, test-ninja-clang-debug, 20)	1m 16s
build (clang-release-cxx17, ninja-clang-release, build-ninja-clang-release, test-ninja-clang-rele...	1m 9s
build (clang-release-cxx20, ninja-clang-release, build-ninja-clang-release, test-ninja-clang-rele...	1m 18s
build (gcc-debug-cxx17, ninja-gcc-debug, build-ninja-gcc-debug, test-ninja-gcc-debug, 17)	1m 4s
build (gcc-debug-cxx20, ninja-gcc-debug, build-ninja-gcc-debug, test-ninja-gcc-debug, 20)	1m 17s
build (gcc-release-cxx17, ninja-gcc-release, build-ninja-gcc-release, test-ninja-gcc-release, 17)	1m 21s
build (gcc-release-cxx20, ninja-gcc-release, build-ninja-gcc-release, test-ninja-gcc-release, 20)	1m 15s
	9m 55s

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