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/mgl/bitmap.h

@@ -38,8 +38,6 @@ public:
     wxBitmap(const wxString &filename, wxBitmapType type = wxBITMAP_TYPE_RESOURCE);
     wxBitmap(const wxImage& image, int depth = -1);
     virtual ~wxBitmap() {}
-    bool Ok() const { return IsOk(); }
-    bool IsOk() const;
 
     bool Create(int width, int height, int depth = -1);