Windows: Support deploying the Swift runtime without plutil.exe

[tristanlabelle]

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.

swift-installer-scripts/platforms/Windows/rtl/lib/rtllib.wxs

Line 99 in 537bce7

<File Source="$(SDK_ROOT)\usr\bin\plutil.exe" />