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

* commit '5fe77401c6a15732d9070f6f084b33e6924c285a':
  Suppress unused-parameter warnings in zopfli.

Change-Id: I204dbb73584a1acb51bc074035cb6f3713722245