Add libsdl1.2debian to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3926
Add libsdl1.2debian to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3926

Packages: libsdl1.2debian libsdl1.2-dev libsdl1.2-dbg

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