From Norman Vine (with small tweaks by Robert Osfield), build fixes for Cygwin

include/osgUtil/CullVisitor

@@ -14,6 +14,9 @@
 #ifndef OSGUTIL_CULLVISITOR
 #define OSGUTIL_CULLVISITOR 1
 
+#include <map>
+#include <vector>
+
 #include <osg/NodeVisitor>
 #include <osg/BoundingSphere>
 #include <osg/BoundingBox>
@@ -24,16 +27,12 @@
 #include <osg/Impostor>
 #include <osg/ClearNode>
 #include <osg/Notify>
-#include <osg/Notify>
 
 #include <osg/CullStack>
 
 #include <osgUtil/RenderGraph>
 #include <osgUtil/RenderStage>
 
-#include <map>
-#include <vector>
-
 #include <osg/Vec3>
 
 namespace osgUtil {

include/osgUtil/SmoothingVisitor

@@ -30,11 +30,9 @@ class OSGUTIL_EXPORT SmoothingVisitor : public osg::NodeVisitor
     public:
 
         /// default to traversing all children.
-        SmoothingVisitor()
-        {
-            setTraversalMode(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN);
-        }
-
+        SmoothingVisitor();
+        virtual ~SmoothingVisitor();
+        
         /// smooth geoset by creating per vertex normals.
         static void smooth(osg::Geometry& geoset);