add the copyctor feature/directive to enable automatic copy constructors. In the way, fix how default ctor/dtor are added

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@8129 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Lib/std/std_streambuf.i

@@ -80,6 +80,9 @@ namespace std {
   protected:
     basic_streambuf();
 
+  private:
+    basic_streambuf(const basic_streambuf&);
+
   }; 
 }