Add libvorbis-dev to ubuntu-precise; resolves travis-ci/travis-ci#3857
Add libvorbis-dev to ubuntu-precise; resolves travis-ci/travis-ci#3857

rnestler/apt-package-whitelist,rnestler/apt-package-whitelist,thedrow/apt-package-whitelist,xiphiaz/apt-package-whitelist,phw/apt-package-whitelist,travis-ci/apt-package-whitelist,jschlyter/apt-package-whitelist,Tyrael/apt-package-whitelist,AlCutter/apt-package-whitelist,jschlyter/apt-package-whitelist,jmerkow/apt-package-whitelist,sternb0t/apt-package-whitelist,Tyrael/apt-package-whitelist,christophgysin/apt-package-whitelist,AlCutter/apt-package-whitelist,sternb0t/apt-package-whitelist,jmerkow/apt-package-whitelist,christophgysin/apt-package-whitelist,thedrow/apt-package-whitelist,xiphiaz/apt-package-whitelist,phw/apt-package-whitelist,travis-ci/apt-package-whitelist