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

[Marcus Hirt]

On Fri, 18 Sep 2020 19:26:07 GMT, Schalli1987 <github.com+11866488+Schalli1987 at openjdk.org> wrote:

>> Second try, I signed the OCA last week (also I do not have any response).
>> 
>> This script provides an easy way to package JMC by just calling a single command.
>
> Schalli1987 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo

Marked as reviewed by hirt (Lead).

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