Deprecate useless wxGenericImageList::Create() overload

This overload doesn't do anything and doesn't exist in the MSW version,
so deprecate it.

include/wx/generic/imaglist.h

@@ -25,7 +25,6 @@ public:
     wxGenericImageList( int width, int height, bool mask = true, int initialCount = 1 );
     virtual ~wxGenericImageList();
     bool Create( int width, int height, bool mask = true, int initialCount = 1 );
-    bool Create();
 
     virtual int GetImageCount() const;
     virtual bool GetSize( int index, int &width, int &height ) const;
@@ -45,6 +44,11 @@ public:
               int flags = wxIMAGELIST_DRAW_NORMAL,
               bool solidBackground = false);
 
+#if WXWIN_COMPATIBILITY_3_0
+    wxDEPRECATED_MSG("Don't use this overload: it's not portable and does nothing")
+    bool Create() { return true; }
+#endif // WXWIN_COMPATIBILITY_3_0
+
     // Internal use only
     const wxBitmap *GetBitmapPtr(int index) const;
 private:

src/generic/imaglist.cpp

@@ -49,11 +49,6 @@ bool wxGenericImageList::Create( int width, int height, bool WXUNUSED(mask), int
 {
     m_size = wxSize(width, height);
 
-    return Create();
-}
-
-bool wxGenericImageList::Create()
-{
     return true;
 }