RFR: 893: Skara has no mailing list rule for some macOS native client code

[Phil Race]

I'd like to add this rule

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Commit messages:
 - 893: Skara has no mailing list rule for some macOS native client code

Changes: https://git.openjdk.java.net/skara/pull/1006/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1006&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-893
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/1006.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1006/head:pull/1006

PR: https://git.openjdk.java.net/skara/pull/1006