add IsOk() to all classes having Ok() method (patch 1570985)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41751 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/colour.h

@@ -45,7 +45,8 @@ public:
 
     virtual bool FromString(const wxChar *str);
 
-    bool Ok() const { return m_refData != NULL; }
+    bool Ok() const { return IsOk(); }
+    bool IsOk() const { return m_refData != NULL; }
 
     bool operator == ( const wxColour& col ) const;
     bool operator != ( const wxColour& col ) const { return !(*this == col); }