RFR: 7477: JMC8.2 does not build with eclipse 4.19 (21-03)

[Marcus Hirt]

Something funny is happening with the workflow. Trying in a separate PR to see if it can be reproduced.

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Commit messages:
 - 7477: Remove old platforms

Changes: https://git.openjdk.java.net/jmc/pull/367/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=367&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7477
  Stats: 448 lines in 10 files changed: 0 ins; 448 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/367.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/367/head:pull/367

PR: https://git.openjdk.java.net/jmc/pull/367