added missing consts and pass objects by const reference instead of by value (patch 1205869)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35665 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/fileconf.h

@@ -200,7 +200,7 @@ private:
   void CleanUp();
 
   // parse the whole file
-  void Parse(wxTextBuffer& buffer, bool bLocal);
+  void Parse(const wxTextBuffer& buffer, bool bLocal);
 
   // the same as SetPath("/")
   void SetRootPath();