InstallRequiredSystemLibraries: Add support for VS 2017

VS 2017 (VS 15) places its redist DLLs in `Microsoft.VC150.*`
directories but still uses version number `140` in the DLL names.  The
redist directories now have version numbers in their name, and the MSVC
and MFC runtime DLLs may be in directories with different versions.
Fill out our logic to handle this.

For now assume we are given the `MSVC_REDIST_DIR` value as a cache
entry.  Unfortunately we cannot yet find the VS 2017 MSVC redist
directory automatically since there is no registry entry for the VS
installation.  Later we will have to use `cmVSSetupHelper` for this.

Issue: #16735

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