RFR: 1663: Mark integrated Pull Requests as properly merged in GitHub repositories [v3]

[Julian Waters]

> WIP

Julian Waters has updated the pull request incrementally with two additional commits since the last revision:

 - Whitespace
 - Remove all reliance on the dependency branches

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

Changes:
  - all: https://git.openjdk.org/skara/pull/1409/files
  - new: https://git.openjdk.org/skara/pull/1409/files/8ca08323..ebdace0b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1409&range=02
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1409&range=01-02

  Stats: 19 lines in 1 file changed: 9 ins; 8 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1409.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1409/head:pull/1409

PR: https://git.openjdk.org/skara/pull/1409