[Rev 01] RFR: 6744: Upgrading to Eclipse RCP 2020-03

[Marcus Hirt]

> Using 2020-03 as default. Removing 2019-09.

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

  Switching to 2019-12 as default until Fedora crash is properly investigated

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

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/69/files
  - new: https://git.openjdk.java.net/jmc/pull/69/files/fead4815..3f10581a

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/69/webrev.01
 - incr: https://webrevs.openjdk.java.net/jmc/69/webrev.00-01

  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/69.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/69/head:pull/69

PR: https://git.openjdk.java.net/jmc/pull/69