RFR: 6889: Provide build script for making it easier to build JMC [v7]

[Schalli1987]

> 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 refreshed the contents of this pull request, and previous commits have been removed. The incremental
views will show differences compared to the previous content of the PR. The pull request contains one new commit since
the last revision:

  Fix typo

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/100/files
  - new: https://git.openjdk.java.net/jmc/pull/100/files/fce3dfae..deb105d3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=100&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=100&range=05-06

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/100.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/100/head:pull/100

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