Fix compile failure

sql/ds_mrr.h

@@ -69,5 +69,3 @@ private:
                                uint *buffer_size, COST_VECT *cost);
 };
 
-void push_index_cond(JOIN_TAB *tab, uint keyno, bool other_tbls_ok);
-

sql/sql_select.h

@@ -780,4 +780,5 @@ inline bool optimizer_flag(THD *thd, uint flag)
 
 void eliminate_tables(JOIN *join);
 
+void push_index_cond(JOIN_TAB *tab, uint keyno, bool other_tbls_ok);