[build] Do not override macOS deployment target when macCatalyst is enabled #76124
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Cxx.swiftmodule should built with a macOS deployment target set to 10.9, the minimum possible version. Since we enabled macCatalyst for this target, it inadvertently started being built with a deployment target set to 13.0, which is too new and is causing build errors in certain projects.
This change makes sure that for Swift targets within the Swift project that explicitly specify
DEPLOYMENT_VERSION_OSX
, the macCatalyst build logic doesn't silently discard this flag.rdar://133008827