Removed unused method.


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14318 16af8721-9629-0410-8352-f15c8da7e697
From Pjotr Svetachov, "I made a small change to DataOutputStream.cpp which makes saving Geodes possible again. This is only half a fix as it only will save a Drawable that is part of a Geode. But this change does not require a version bump of the .ive format. I tried it with a few datasets we have here with the 3.2 stable branch and the trunk with this patch and there was no difference in the .ive files that were produced."


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14319 16af8721-9629-0410-8352-f15c8da7e697