Add libwnck22 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2677
Add libwnck22 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2677

Packages: libwnck22 libwnck-dev libwnck-common gir1.2-wnck-1.0

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