add const qualifiers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/statbmp.h

@@ -72,7 +72,7 @@ public:
         
         @see SetBitmap()
     */
-    wxBitmap GetBitmap();
+    wxBitmap GetBitmap() const;
 
     /**
         Returns the icon currently used in the control. Notice that this method can
@@ -82,7 +82,7 @@ public:
         
         @see SetIcon()
     */
-    wxIcon GetIcon();
+    wxIcon GetIcon() const;
 
     /**
         Sets the bitmap label.