Remove assignments of the $MASTER_MYSOCK variable.

This variable is defined by default and one should not do it
directly as the socket variable is not available on Windows.

mysql-test/suite/funcs_1/datadict/table_constraints.inc

@@ -33,7 +33,6 @@ ORDER BY table_schema,table_name,constraint_name;
 eval $my_select;
 
 --echo # Establish connection testuser1 (user=testuser1)
-let $MASTER_MYSOCK= query_get_value(SHOW VARIABLES LIKE 'socket', Value, 1);
 --replace_result $MASTER_MYPORT MYSQL_PORT $MASTER_MYSOCK MYSQL_SOCK
 connect (testuser1,localhost,testuser1,,db_datadict);
 eval $my_select;