RFR: 7236: Adding project specific settings to ignore forbidden references

[Marcus Hirt]

Since JBS is down for maintenance, I'll add an issue once it's up and happy again.

Update: added issue.

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Commit messages:
 - Adding project specific settings to ignore forbidden references

Changes: https://git.openjdk.java.net/jmc/pull/236/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=236&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7236
  Stats: 102 lines in 1 file changed: 102 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/236.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/236/head:pull/236

PR: https://git.openjdk.java.net/jmc/pull/236