Suppress unused-parameter warnings in zopfli.
am: f1dd0f33b4

* commit 'f1dd0f33b40d833b5c42d0976c75ffab715e0eac':
  Suppress unused-parameter warnings in zopfli.

Change-Id: Ie105a5015b2c6d3560514890b30d0548ffe49a87