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This creates Servo.app and puts it in a dmg along with a symlink to `/Applications`.
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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
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- [ ] There are tests for these changes OR
- [X] These changes do not require tests because creating packager
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Source-Repo: https://github.com/servo/servo
Source-Revision: 7b2080c5b7c933f74c0d92249a66f8602340ebbe
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rename : servo/resources/prefs.json => servo/resources/package-prefs.json
Connor Brewster