RFR: 6945: Create build script for Windows

[Jean-Philippe Bempel]

On Sat, 31 Oct 2020 07:35:16 GMT, Guru Hb <ghb at openjdk.org> wrote:

>> Build script for windows mimics behavior of the *nix one
>> 
>> Special handling for Jetty server with killing it at the end of the action
>
> Let me check on Windows build and update my comments.

@thegreystone I was afraid of that, but the way I generate a timestamp for the log files is fragile as it relies on date expressed in us format from `%date%` env var.
I need to find another way... :-/

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PR: https://git.openjdk.java.net/jmc/pull/147