Added different cmake version requirements across platforms
Added different cmake version requirements across platforms


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