RFR: 8120: Build JMC for Linux aarch64 [v2]

[Marcus Hirt]

> It was asked for at Adoptium, issue 46:
> https://github.com/adoptium/jmc-build/issues/46
> 
> I don't have an M1 with Linux installed, so I have no way of verifying this, unfortunately. Perhaps someone out there can help.

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Updating README

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

Changes:
  - all: https://git.openjdk.org/jmc/pull/514/files
  - new: https://git.openjdk.org/jmc/pull/514/files/ec6d45c4..7031f252

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=514&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=514&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jmc/pull/514.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/514/head:pull/514

PR: https://git.openjdk.org/jmc/pull/514