Remove EXCLUDED_ARCHS from all Xcode projects to allow fat platform libraries to be built.
Script copy_lib_to_staging.sh no longer breaks fat libraries into single-architecture
libraries, and simply copies fat file to XCFramework staging area.
This permits support for arm64 on macOS, and arm64e on iOS and tvOS.
Creating a Simulator dylib containing both x86_64 and arm64 (Apple Silicon)
architectures is not currently supported by Xcode, so Simulator dylibs are skipped.
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