Fix travis-ci build config for new build system

.travis.yml

@@ -11,4 +11,4 @@ before_script:
   - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
   - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   
-script: scons bin/godot
+script: scons platform=x11