macos

Fix header scanning regex #705

Job	Run time
build (AppleClang, Headers, Debug)	53s
build (AppleClang, Headers, Release)	1m 5s
build (LLVM-Clang-16, Headers, Debug)	1m 11s
build (LLVM-Clang-16, Headers, Release)	1m 20s
build (LLVM-Clang-17, Headers, Debug)	1m 16s
build (LLVM-Clang-17, Headers, Release)	1m 21s
build (LLVM-Clang-17, Module, Debug)	1m 14s
build (LLVM-Clang-17, Module, Release)	1m 19s
build (LLVM-Clang-18, Headers, Debug)	56s
build (LLVM-Clang-18, Headers, Release)	1m 8s
build (LLVM-Clang-18, Module, Debug)	1m 11s
build (LLVM-Clang-18, Module, Release)	1m 1s
build (LLVM-Clang-19, Headers, Debug)	1m 20s
build (LLVM-Clang-19, Headers, Release)	1m 22s
build (LLVM-Clang-19, Module, Debug)	1m 41s
build (LLVM-Clang-19, Module, Release)	1m 21s
	19m 39s

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