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/region.h

@@ -82,9 +82,6 @@ public:
     // accessors
     // ---------
 
-    bool Ok() const { return IsOk(); }
-    bool IsOk() const { return m_refData != NULL; }
-
     // Is region empty?
     virtual bool IsEmpty() const = 0;
     bool Empty() const { return IsEmpty(); }