Suppress unused-parameter warnings in zopfli. am: f1dd0f33b4 am: 5fe77401c6 am: 01836cb13b
am: b9fab8a946

* commit 'b9fab8a946d131581d1a7589ddd956d77612363b':
  Suppress unused-parameter warnings in zopfli.

Change-Id: I924e72d9bb39f56819a4b635d7394c8c6a303945