[cmake, 6.3] fix libswiftCompatibilitySpan for maccatalyst builds#86071

glessard merged 1 commit intoswiftlang:release/6.3swiftlang/swift:release/6.3from

glessard:rdar163874201-libSwiftCompatibilitySpan-buildfix-63glessard/swift:rdar163874201-libSwiftCompatibilitySpan-buildfix-63Copy head branch name to clipboard