[osg-submissions] Do not cull inactive culling drawables

Mathieu MARACHE

2017-12-01 15:48:31 UTC

Drawable that had `setCullingActive(false)` could still be culled without
this fix
https://github.com/openscenegraph/OpenSceneGraph/pull/399 on
OpenSceneGraph-3.4
https://github.com/openscenegraph/OpenSceneGraph/pull/400 on master
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