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

[Schalli1987]

On Fri, 18 Sep 2020 19:51:59 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Ugh:
>> Last commit:
>> Author: Schalli1987 <github at schal.li>
>> vs. other commits:
>> Author: Andreas Schaller <schalli1987 at gmail.com>
>
> @Schalli1987 - can you force push an amend?

Done ��

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