Upgrade the ffmpeg Portage package

This CL upgrades media-video/ffmpeg to version 0.7.8 on x86. The library
is necessary to process video streams from camera in factory tests.

BUG=chrome-os-partner:6497
TEST='emerge-x86-alex ffmpeg' works
TEST='emerge-x86-alex alsa-plugins' works
TEST='./build_image --board=x86-alex --factory' works

Change-Id: I616d0f74ee7252ae718f47b2c13fccc3e6b1d74e
Reviewed-on: https://gerrit.chromium.org/gerrit/13703
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Tai-Hsu Lin <sheckylin@chromium.org>
Tested-by: Tai-Hsu Lin <sheckylin@chromium.org>
2 files changed