Unused code removed.

sql/sql_lex.cc

@@ -2380,6 +2380,7 @@ void st_select_lex_unit::exclude_level()
 }
 
 
+#if 0
 /*
   Exclude subtree of current unit from tree of SELECTs
 
@@ -2405,6 +2406,7 @@ void st_select_lex_unit::exclude_tree()
   if (next)
     next->prev= prev;
 }
+#endif
 
 
 /*

sql/sql_lex.h

@@ -697,7 +697,7 @@ class st_select_lex_unit: public st_select_lex_node {
   }
   st_select_lex* return_after_parsing() { return return_to; }
   void exclude_level();
-  void exclude_tree();
+  // void exclude_tree(); // it is not used for long time
   bool is_excluded() { return prev == NULL; }
 
   /* UNION methods */