fix pdo_039.phpt test for Oracle

Author: mvorisek

ext/pdo/tests/pdo_039.phpt

@@ -29,6 +29,9 @@ if ($pass === false) $pass = NULL;
 $conn = new PDO($dsn, $user, $pass, $attr);
 
 $query = 'SELECT 1';
+if ($conn->getAttribute(PDO::ATTR_DRIVER_NAME) === 'oci') {
+    $query .= ' FROM DUAL';
+}
 
 var_dump($conn->errorCode());
 $stmt = $conn->prepare($query);