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Keep Objective-C configuration copies independent and owned #2039

Job	Run time
build (macos-14, debug, 'iPhone 15')	16m 54s
build (macos-14, debug, 'iPad Pro (11-inch) (4th generation)')	19m 22s
build (macos-14, release, 'iPhone 15')	22m 7s
build (macos-15, debug, 'iPhone 16')	25m 24s
build (macos-15, release, 'iPad Air 11-inch (M2)')	19m 46s
build (macos-15, release, 'iPhone 16')	17m 23s
build (macos-15, debug, 'iPad Air 11-inch (M2)')	27m 23s
build (macos-14, release, 'iPad Pro (11-inch) (4th generation)')	17m 42s
	2h 46m 1s