fix overloaded virtual warning

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59266 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/icon.h

@@ -42,8 +42,13 @@ public:
 
     virtual ~wxIcon();
 
-    bool LoadFile(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
-                  int desiredWidth = -1, int desiredHeight = -1);
+    bool LoadFile(const wxString& name, wxBitmapType type,
+                  int desiredWidth, int desiredHeight);
+
+    // unhide the base class version
+    virtual bool LoadFile(const wxString& name,
+                          wxBitmapType flags = wxICON_DEFAULT_TYPE)
+        { return LoadFile(name, flags); }
 
     // create from bitmap (which should have a mask unless it's monochrome):
     // there shouldn't be any implicit bitmap -> icon conversion (i.e. no