RFR: JDK-8202557: OpenJDK fails to start in Windows 7 and 8.1 after upgrading compiler to VC 2017

[Tim Bell]

Erik:

> With the new VS2017 toolchain Microsoft has changed how the C++
> libraries work. In addition to the old msvcr* and msvcp* dll files, we
> now have a big lot of UCRT dlls as well. These files are also
> redistributable but are found in the Windows Kit rather than the Visual
> Studio installation. On modern and updated Windows systems these files
> should be present on the system, but to support older and non updated
> OSes, you can bundle them with your app, just like we already do with
> the old msvc* files.
>
> This patch does the following:
>
> * Adds the UCRT dll files to the windows devkit
> * Adds logic in configure for finding the correct UCRT redist dir if the
> toolchain version needs it
> * Makes the build copy the files into java.base
> * Makes sure any of these files are filtered out of any imported module
> to avoid conflicts
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8202557
>
> Webrev: http://cr.openjdk.java.net/~erikj/8202557/webrev.01/index.html


Looks good.

Tim