Roll libvpx to Duclair
Roll libvpx to Duclair

BUG=None
TEST=libvpx builds and runs on all platforms.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=122976

Review URL: https://chromiumcodereview.appspot.com/9428017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@122988 0039d316-1c4b-4281-b951-d872f2087c98

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