Suppress warnings in libexif. am: 57a91883d8 am: e4d73ae7db
am: 8388467014

* commit '83884670140be8558eb330b6e68142b56ee46c42':
  Suppress warnings in libexif.

Change-Id: I63e477daa2b7218c414cf28e31b05065b16ffaac