macos

Add AppleClang to CI tests #687

Job	Run time
build (AppleClang, Headers, Debug)	50s
build (AppleClang, Headers, Release)	55s
build (LLVM-Clang-16, Headers, Debug)	1m 7s
build (LLVM-Clang-16, Headers, Release)	1m 15s
build (LLVM-Clang-17, Headers, Debug)	1m 14s
build (LLVM-Clang-17, Headers, Release)	1m 16s
build (LLVM-Clang-17, Module, Debug)	1m 12s
build (LLVM-Clang-17, Module, Release)	1m 18s
build (LLVM-Clang-18, Headers, Debug)	53s
build (LLVM-Clang-18, Headers, Release)	59s
build (LLVM-Clang-18, Module, Debug)	52s
build (LLVM-Clang-18, Module, Release)	58s
build (LLVM-Clang-19, Headers, Debug)	1m 30s
build (LLVM-Clang-19, Headers, Release)	1m 25s
build (LLVM-Clang-19, Module, Debug)	1m 20s
build (LLVM-Clang-19, Module, Release)	1m 16s
	18m 20s

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