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tigercosmos c1a31c5859 servo: Merge #19713 - auto clean cache in build bot (from tigercosmos:r1); r=jdm

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auto clean cache in build bot

once this merged, servo/saltfs#321 should be closed

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #19712  (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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Source-Repo: https://github.com/servo/servo
Source-Revision: d11886e9a12c2ef7262e34de3de7595005a66080

2018-01-18 08:09:59 -06:00