RFR: 7902924: Add build script for jtreg plugin [v4]

[Maurizio Cimadamore]

On Wed, 5 May 2021 20:35:32 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> or, should we just link here?
> https://docs.gradle.org/current/userguide/build_environment.html#sec:accessing_the_web_via_a_proxy

nvm - I think your suggestion is clearer

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PR: https://git.openjdk.java.net/jtreg/pull/9