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/palette.h

@@ -59,9 +59,6 @@ public:
                 ,unsigned char* pBlue
                ) const;
 
-    virtual bool Ok() const { return IsOk(); }
-    virtual bool IsOk(void) const { return (m_refData != NULL) ; }
-
     virtual bool FreeResource(bool bForce = false);
 
     inline WXHPALETTE GetHPALETTE(void) const { return (M_PALETTEDATA ? M_PALETTEDATA->m_hPalette : 0); }