[zlib-ng] enable dataflow config (#1632). (#3276)
[zlib-ng] enable dataflow config (#1632). (#3276)

Tested with https://pantheon.corp.google.com/logs/viewer?resource=build%2Fbuild_id%2F1890c88d-999b-4a95-9d21-20fa60f33e59&project=oss-fuzz&minLogLevel=0&expandAll=false&timestamp=2020-01-21T23:46:42.489000000Z&customFacets=&limitCustomFacetWidth=true&dateRangeEnd=2020-01-21T23:43:33.616Z&interval=PT1H&dateRangeUnbound=backwardInTime&scrollTimestamp=2020-01-21T20:51:17.760469836Z
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