Added virtual destructors to supress compiler warnings on OCRopus.

That should be harmless.


git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@12 d0cd1f9f-072b-0410-8dd7-cf729c803f20

display/cmndwin.h

@@ -62,6 +62,8 @@ class COMMAND_WINDOW
                    const char *name,  //window name
                    MENU_ROOT *menu_ptr);
 
+    virtual ~COMMAND_WINDOW() {}
+
     void event(                   //Process event //Command event type
                GRAPHICS_EVENT &g_event,
                INT32 *c_event,

display/sbdmenu.h

@@ -95,6 +95,8 @@ class MENU_NODE
                                INT16 width);  //required width
 
   public:
+    virtual ~MENU_NODE() {}
+
                                  //return ptr to name
     virtual const char *cmp_str() { 
       return name.string ();