RFR: 6688: Adding project file for the 2019-12 platform

[Christoph Langer]

6688: Adding project file for the 2019-12 platform

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Commits:
 - 8291e5ef: Patch for JMC-6688

Changes: https://git.openjdk.java.net/jmc/pull/49/files
 Webrev: https://webrevs.openjdk.java.net/jmc/49/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6688
  Stats: 19 lines in 2 files changed: 19 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/49.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/49/head:pull/49

PR: https://git.openjdk.java.net/jmc/pull/49