Made wxGTK compile and link again. Broke wxMSW a little.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4098 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/dataobj2.h

@@ -46,7 +46,6 @@ protected:
     void Clear() { free(m_pngData); }
     void ClearAll() { Clear(); Init(); }
 
-private:
     size_t      m_pngSize;
     void       *m_pngData;
 
@@ -63,6 +62,8 @@ public:
     // implement base class pure virtuals
     // ----------------------------------
 
+    void AddFile( const wxString &filename );
+
     virtual size_t GetDataSize() const;
     virtual bool GetDataHere(void *buf) const;
     virtual bool SetData(size_t len, const void *buf);