InstallRequiredSystemLibraries does not find VS 2017 redist directory

The InstallRequiredSystemLibraries module still uses registry entries to locate the VS redist directories. VS 2017 does not provide registry entries. Instead we need to somehow use cmVSSetupHelper (added by !337 (merged)) to locate the redist directory, even when not using the Visual Studio 15 2017 generator.

Furthermore, the redist directories sit under a version-numbered directory such as VC/Redist/MSVC/14.10.25008.

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