Windows: Support deploying the Swift runtime without plutil.exe

SwiftFormat now embeds the Swift runtime that it depends on, which results in it deploying `plutil.exe` in its program files directory, a surprising outcome. The installer should at least provide an option to not include this file, and we could consider not including it in the merge module. https://github.com/swiftlang/swift-installer-scripts/blob/537bce74e35ccc3cc4f5222d66e5373accce3961/platforms/Windows/rtl/lib/rtllib.wxs#L99