add const qualifiers

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

interface/choice.h

@@ -109,7 +109,7 @@ public:
         @remarks This is implemented for Motif only and always returns 1 for the
                  other platforms.
     */
-    int GetColumns();
+    int GetColumns() const;
 
     /**
         Unlike wxControlWithItems::GetSelection which only
@@ -122,7 +122,7 @@ public:
         wxControlWithItems::GetSelection itself behaved like
         this).
     */
-    int GetCurrentSelection();
+    int GetCurrentSelection() const;
 
     /**
         Sets the number of columns in this choice item.