[osg3.6] prevent immutability setting when textureobject is taken from orphans#934

openscenegraph merged 1 commit intoopenscenegraph:OpenSceneGraph-3.6openscenegraph/OpenSceneGraph:OpenSceneGraph-3.6from

mp3butcher:orphanalreadyimmutablemp3butcher/OpenSceneGraph:orphanalreadyimmutableCopy head branch name to clipboard