Removed redundent spaces


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14569 16af8721-9629-0410-8352-f15c8da7e697
Moved GLBufferObject::Extensions structure into osg::GL2Extensions


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14570 16af8721-9629-0410-8352-f15c8da7e697