Suppress unused-parameter warnings in zopfli. am: f1dd0f33b4 am: 5fe77401c6
am: 01836cb13b

* commit '01836cb13b04b6917a4ed55739fce620bb23f9d9':
  Suppress unused-parameter warnings in zopfli.

Change-Id: Ie20fa65d326f17b54920800e3270aae280a87aff