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Keep Objective-C configuration copies independent and owned #6725

Job	Run time
Linux Curl without C++ exceptions	20s
build (debug, ubuntu-latest)	10m 35s
Public header gate (GCC/Clang)	53s
build (debug, macOS-latest)	10m 52s
build (release, ubuntu-latest)	10m 1s
build (release, macOS-latest)	10m 10s
	42m 51s