Remove extraneous class delimiter to fix compile errors on HP-UX.

sql/item.h

@@ -252,7 +252,7 @@ class Item_ident :public Item
   st_select_lex *depended_from;
   Item_ident(const char *db_name_par,const char *table_name_par,
 	     const char *field_name_par);
-  Item_ident::Item_ident(THD *thd, Item_ident *item);
+  Item_ident(THD *thd, Item_ident *item);
   const char *full_name() const;
 
   bool remove_dependence_processor(byte * arg);