Fix Ok/IsOk() mess in wxGDIObject-derived classes; also added

wxGDIObject::Create/CloneGDIRefData() and implemented them for (almost) all
ports


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50727 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/brush.h

@@ -68,9 +68,6 @@ public:
     inline wxBitmap* GetStipple(void) const { return (M_BRUSHDATA ? & M_BRUSHDATA->m_vStipple : 0); };
     inline int       GetPS(void) const { return (M_BRUSHDATA ? M_BRUSHDATA->m_hBrush : 0); };
 
-    inline virtual bool Ok() const { return IsOk(); }
-    inline virtual bool IsOk(void) const { return (m_refData != NULL) ; }
-
     //
     // Implementation
     //