Add libwnck-3-0 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2217
Add libwnck-3-0 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2217

Packages: libwnck-3-0 libwnck-3-dev libwnck-3-common gir1.2-wnck-3.0

travis-ci/apt-package-whitelist,travis-ci/apt-package-whitelist