Update FLAC to 1.3.1

This includes fixes for CVE-2014-9028 and CVE-2014-8962
(which shouldn't affect Chromium since we only use FLAC for
encoding).

It also reduces the number of downstream patches.

BUG=https://bugs.chromium.org/p/chromium/issues/detail?id=610125
R=felt@chromium.org, tommi@chromium.org

Review URL: https://codereview.chromium.org/1961133002 .
71 files changed