* [libwebp] enable dataflow config (#1632). Tested as https://pantheon.corp.google.com/logs/viewer?resource=build%2Fbuild_id%2F8b9c16ef-8238-44c1-817c-03602fff5583&project=oss-fuzz&minLogLevel=0&expandAll=false×tamp=2020-01-21T23:43:43.816000000Z&customFacets=&limitCustomFacetWidth=true&dateRangeEnd=2020-01-21T23:43:11.054Z&interval=PT1H&dateRangeUnbound=backwardInTime&scrollTimestamp=2020-01-21T19:46:16.396688731Z * Update project.yaml