Test integer credit cards only on 64 bits system

Integer credit card fails on 32bits system because the integer is too long.

Method for 64bits detection: http://stackoverflow.com/a/5424121/1731473

tests/IsoCodes/Tests/CreditCardTest.php

@@ -14,7 +14,7 @@ class CreditCardTest extends AbstractIsoCodeInterfaceTest
      */
     public function getValidValues()
     {
-        return array(
+        $values = array(
             array('340000000000009'),   //American Express
             array('30000000000004'),    //Carte Blanche
             array('6011000000000004'),  //Discover
@@ -26,8 +26,12 @@ public function getValidValues()
             array('4903010000000009'),  //Switch
             array('4111111111111111'),  //Visa
             array('6304100000000008'),  //Laser
-            array(6304100000000008),    //Laser
         );
+
+        // To be removed on 4.0.
+        if (8 === PHP_INT_SIZE) { // This test will success only on 64bits systems.
+            $values[] = array(6304100000000008); // Laser
+        }
     }
 
     /**