Bug 1769492 Comment 20 Edit History

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Backed out for causing webrender bustages in conftest.c
* [Backout link](https://hg.mozilla.org/integration/autoland/rev/d9ad55d66d8523561815b7fbeef13f84428eb55b)
* [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&fromchange=165132d2257e3b96cd4e136c4af1296a2526da7b&searchStr=linux%2Cx64%2Cwebrender%2Cdebug%2Cwebrender%2Cstandalone%2Cwebrender-linux64-debug%2Cwrench&selectedTaskRun=OG7KyY82SEmKx2sujZzbaA.0&tochange=987284103c26599be1cfe7738d0780c6253fb5cb) 
* [Failure Log](https://treeherder.mozilla.org/logviewer?job_id=450587120&repo=autoland) 
* Failure lines: [servo-fontconfig-sys 5.1.0] conftest.c:85:26: fatal error: atomic.h: No such file or directory
subprocess.CalledProcessError: Command '['../target/release/wrench', '--no-scissor', '--headless', 'reftest']' died with <Signals.SIGABRT: 6>.

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