freetype: upgrade package to 2.6.1

Upgrade media-libs/freetype to version 2.6.1

See the bug for details.

BUG=chromium:534621
TEST=`emerge-{BOARD} freetype` on x86-generic, daisy, link
TEST=`cbuildbot --remote -g 304340 chromiumos-sdk
      x86-alex-release daisy-release`

Change-Id: I4c380c1d9f11757f5fe2ea93b190286909599657
Previous-Reviewed-on: https://chromium-review.googlesource.com/304340
(cherry picked from commit ca734fdff6603aec353231367694b4e325e9c5ad)
Reviewed-on: https://chromium-review.googlesource.com/304875
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
4 files changed