Added virtual destructors

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14351 16af8721-9629-0410-8352-f15c8da7e697

src/osgPlugins/osc/OscSendingDevice.cpp

@@ -373,6 +373,8 @@ public:
     virtual void apply(const osg::Matrixf& value)   { for(unsigned int i=0; i<16; ++i) _stream << (value.ptr())[i]; }
     virtual void apply(const osg::Matrixd& value)   { for(unsigned int i=0; i<16; ++i) _stream << (value.ptr())[i]; }
 
+    virtual ~OscSendingDeviceGetValueVisitor() {}
+
 private:
     osc::OutboundPacketStream& _stream;
 

src/osgPresentation/deprecated/PropertyManager.cpp

@@ -179,6 +179,8 @@ public:
     virtual void apply(osg::Matrixf& value)     { combineMatrixUserValue(value); }
     virtual void apply(osg::Matrixd& value)     { combineMatrixUserValue(value); }
 
+    virtual ~MySetValueVisitor() {}
+
     double _r1, _r2;
     osg::ValueObject* _object2;
 };