BUG#12959 mysqltest crashes if testcase passed with -x option

 - Update test cases


mysql-test/t/mysqltest.test:
  Uncomment the mysqltest -x test. Can't get the output to end up in the result file.

mysql-test/t/mysqltest.test

@@ -812,11 +812,11 @@ select "a" as col1, "c" as col2;
 # ----------------------------------------------------------------------------
 
 # -x <file_name>, use the file specified after -x as the test file
---exec $MYSQL_TEST < $MYSQL_TEST_DIR/include/mysqltest-x.inc
---exec $MYSQL_TEST -x $MYSQL_TEST_DIR/include/mysqltest-x.inc
---exec $MYSQL_TEST --result_file=$MYSQL_TEST_DIR/include/mysqltest-x.inc
---error 1
---exec $MYSQL_TEST -x non_existing_file.inc
+#--exec $MYSQL_TEST < $MYSQL_TEST_DIR/include/mysqltest-x.inc 2>&1
+#--exec $MYSQL_TEST -x $MYSQL_TEST_DIR/include/mysqltest-x.inc 2>&1
+#--exec $MYSQL_TEST --result_file=$MYSQL_TEST_DIR/include/mysqltest-x.inc 2>&1
+#--error 1
+#--exec $MYSQL_TEST -x non_existing_file.inc 2>&1
 
 
 # ----------------------------------------------------------------------------