Added friend struct ViewData to try and avoid compile issues under HP-UX

include/osgShadow/MinimalDrawBoundsShadowMap

@@ -78,6 +78,8 @@ class OSGSHADOW_EXPORT MinimalDrawBoundsShadowMap
             ViewData( void ): _boundAnalysisSize( 64, 64 ) {}
         };
 
+        friend struct ViewData;
+
         META_ViewDependentShadowTechniqueData( ThisClass, ThisClass::ViewData )
 
 

include/osgShadow/StandardShadowMap

@@ -186,6 +186,8 @@ class OSGSHADOW_EXPORT StandardShadowMap : public DebugShadowMap
                 const osg::Vec3 &worldLightUp
                 = osg::Vec3(0,1,0) );
         };
+        
+        friend struct ViewData;
 
         META_ViewDependentShadowTechniqueData( ThisClass, ThisClass::ViewData )
 };