macos

Merge pull request #216 from tcbrindle/pr/appleclang_ci #689

Job	Run time
build (AppleClang, Headers, Debug)	51s
build (AppleClang, Headers, Release)	1m 1s
build (LLVM-Clang-16, Headers, Debug)	1m 4s
build (LLVM-Clang-16, Headers, Release)	1m 14s
build (LLVM-Clang-17, Headers, Debug)	1m 45s
build (LLVM-Clang-17, Headers, Release)	1m 20s
build (LLVM-Clang-17, Module, Debug)	1m 10s
build (LLVM-Clang-17, Module, Release)	1m 21s
build (LLVM-Clang-18, Headers, Debug)	55s
build (LLVM-Clang-18, Headers, Release)	58s
build (LLVM-Clang-18, Module, Debug)	52s
build (LLVM-Clang-18, Module, Release)	57s
build (LLVM-Clang-19, Headers, Debug)	1m 20s
build (LLVM-Clang-19, Headers, Release)	1m 15s
build (LLVM-Clang-19, Module, Debug)	1m 9s
build (LLVM-Clang-19, Module, Release)	1m 19s
	18m 31s

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