Add libgtkgl2.0-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2663
Add libgtkgl2.0-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#2663

Packages: libgtkgl2.0-dev libgtkgl2.0-1

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