travis: Reduce number of packages installed via apt
travis: Reduce number of packages installed via apt

Use `--no-install-recommends` to only install needed packages.

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master