Import 1.1.0-1+wmf1

* Backport libvpx 1.1.0 to precise
* debian/patches/03_altref_calculation.patch
    + Fix timestamp calculation rollover w/altref
    (https://gerrit.chromium.org/gerrit/#/c/29547/)

Change-Id: Id7a4a0266555758b7cc5a5968a60c2a4e416e793