fix warnings for ruby, add another case

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@6568 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/director_redefined.i

@@ -40,6 +40,11 @@
     {
       return 1;
     }    
+
+    const int& get_rrval(const int& a)
+    {
+      return a;
+    }    
   };  
 }