Merge vvagin@bk-internal.mysql.com:/home/bk/mysql-4.0

into eagle.mysql.r18.ru:/home/vva/work/BUG_2023/mysql-4.0

sql/field.cc

@@ -4721,7 +4721,7 @@ String *Field_enum::val_str(String *val_buffer __attribute__((unused)),
 {
   uint tmp=(uint) Field_enum::val_int();
   if (!tmp || tmp > typelib->count)
-    val_ptr->set((char*)"",0);
+    val_ptr->set((const char*)"",0);
   else
     val_ptr->set((const char*) typelib->type_names[tmp-1],
 		 (uint) strlen(typelib->type_names[tmp-1]));