RFR: git-pr-create: allow --cc for all jdk[0-9]* repos

[Erik Helin]

Hi all,

please review this small patch that makes the `--cc` flag for `git pr create` work for jdk release repositories like [jdk16](https://github.com/openjdk/jdk16).

Thanks,
Erik

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Commit messages:
 - git-pr-create: allow --cc for all jdk[0-9]* repos

Changes: https://git.openjdk.java.net/skara/pull/975/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=975&range=00
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/975.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/975/head:pull/975

PR: https://git.openjdk.java.net/skara/pull/975