Linux: roll ffmpeg deps to get http://codereview.chromium.org/6659038/
Linux: roll ffmpeg deps to get http://codereview.chromium.org/6659038/

This is a part of several changes to fix building with system libvpx.

TBR=scherkus

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/6670032

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77806 0039d316-1c4b-4281-b951-d872f2087c98

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