Add freeglut3 to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3525
Add freeglut3 to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3525

Packages: freeglut3 freeglut3-dev freeglut3-dbg

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