[OCTREE] Attempt a bugfix.

Author: frozar

octree/include/pcl/octree/octree_iterator.h

@@ -536,8 +536,8 @@ namespace pcl
         public:
 
           // public typedefs
-          using OctreeBreadthFirstIterator<OctreeT>::BranchNode;
-          using OctreeBreadthFirstIterator<OctreeT>::LeafNode;
+          using typename OctreeBreadthFirstIterator<OctreeT>::BranchNode;
+          using typename OctreeBreadthFirstIterator<OctreeT>::LeafNode;
 
           /** \brief Empty constructor.
             * \param[in] depth_arg Depth level during traversal