Re-ordered SDL class to try and avoid OSX issues with _main.
Re-ordered SDL class to try and avoid OSX issues with _main.


artoolkit/osg,scrawl/osg,openscenegraph/osg,marchelbling/osg,tomasthoresen/osg,jtorresfabra/osg,scrawl/osg,marchelbling/osg,artoolkit/osg,marchelbling/osg,tomasthoresen/osg,scrawl/osg,jtorresfabra/osg,artoolkit/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,jtorresfabra/osg,tomasthoresen/osg,openscenegraph/osg,scrawl/osg,tomasthoresen/osg,artoolkit/osg,openscenegraph/osg