RFR: 6889: Provide build script for making it easier to build JMC [v6]

[Marcus Hirt]

On Fri, 18 Sep 2020 19:45:15 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Marked as reviewed by hirt (Lead).
>
> JCheck seems to be failing:
> "⚠️ For contributors who are not existing OpenJDK Authors, commit attribution will be taken from the commits in the PR.
> However, the commits in this PR have inconsistent user names and/or email addresses. Please amend the commits."

Ugh:
Last commit:
Author: Schalli1987 <github at schal.li>
vs. other commits:
Author: Andreas Schaller <schalli1987 at gmail.com>

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PR: https://git.openjdk.java.net/jmc/pull/100