RFR: 8255713: JavaFX build should discover Visual Studio compiler on system

[Ambarish Rapte]

On Tue, 16 Mar 2021 16:30:51 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> We currently hard-code the default version of Visual Studio in both `win.gradle` and `.github/workflows/submit.yml`. This hard-coding of the specific version of MSVC is fragile, particularly for GitHub action builds. The last time Microsoft changed the environment, our Windows builds started failing (because we hard-coded it). I temporarily bumped it to the then-current version as a fix for [JDK-8256686](https://bugs.openjdk.java.net/browse/JDK-8256686), and filed this bug -- [JDK-8255713](https://bugs.openjdk.java.net/browse/JDK-8255713) -- as a followup. It's failing again because of another update to the GitHub actions environment, so it's time to fix it to discover the latest version rather than hardcode it.
> 
> NOTE to reviewers: This will need to be tested with local and CI builds as well as GitHub actions, since there are changes in the `win.gradle` script (and associated `genVSproperties.bat` script).

lgtm, local build on my machine completes successfully and GitHub actions build also completed on this PR.

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Marked as reviewed by arapte (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/427