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Update swiftLanguageVersions to swift-tools-version:4.2 #2736
This PR fixes incompatibilities with Swift 5 compiler due to an API change in the Package.swift manifest API.
I've tested this with Swift 4.2.1 (swiftlang-1000.11.42) and Swift 5 (swiftlang-1001.0.63.8), and it appears to work for both. It was difficult to verify because of build errors related to #2698, but I was able to work around that by passing an explicit macOS 10.12 target with the