Stop using Package@swift-version syntax to support SPM in Xcode 13. #16
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It seems that Xcode 13 (as of Xcode 13 Release Candidate at least) stopped recognizing Package@swift-version syntax. When resolving dependencies, SPM uses Package.swift instead of Package@4.2.swift file, causing build failures in Xcode 13.
This PR replaces contents of Package.swift file with contents of Package@4.2.swift file, allowing SPM to succeed.
This probably drops some old Xcodes, but since
swift-tools-version:4.2
is already three years old, and old Xcodes cannot submit to AppStore(at least on iOS), this seems safe to remove.