undo one row warning instead use sql_warnings=1

sql/sql_insert.cc:
  Undo warnings for single row inserts
mysql-test/t/warnings.test:
  undo one row warning instead use sql_warnings=1
mysql-test/r/warnings.result:
  Fix result file

mysql-test/r/warnings.result

@@ -91,8 +91,11 @@ Warning	1263	Data truncated for column 'b' at row 3
 Warning	1261	Data truncated, NULL supplied to NOT NULL column 'a' at row 4
 Warning	1263	Data truncated for column 'b' at row 4
 insert into t2(b) values('mysqlab');
+set sql_warnings=1;
+insert into t2(b) values('mysqlab');
 Warnings:
 Warning	1263	Data truncated for column 'b' at row 1
+set sql_warnings=0;
 drop table t1, t2;
 create table t1(a char(10));
 alter table t1 add b char;

mysql-test/t/warnings.test

@@ -52,6 +52,9 @@ update t1 set d=c;
 create table t2(a tinyint NOT NULL, b char(3));
 insert into t2 select b,c from t1;
 insert into t2(b) values('mysqlab');
+set sql_warnings=1;
+insert into t2(b) values('mysqlab');
+set sql_warnings=0;
 drop table t1, t2;
 
 #

sql/sql_insert.cc

@@ -231,9 +231,7 @@ int mysql_insert(THD *thd,TABLE_LIST *table_list,
   info.update_fields=&update_fields;
   info.update_values=&update_values;
   // Don't count warnings for simple inserts
-  if ((thd->client_capabilities & CLIENT_PROTOCOL_41) || 
-      values_list.elements > 1 || 
-      (thd->options & OPTION_WARNINGS))
+  if (values_list.elements > 1 || (thd->options & OPTION_WARNINGS))
     thd->count_cuted_fields = 1;
   thd->cuted_fields = 0L;
   table->next_number_field=table->found_next_number_field;