Fix support for 32bits PHP

Fix #816

Author: nicolas-grekas

src/JsonSchema/Validator.php

@@ -27,10 +27,10 @@ class Validator extends BaseConstraint
 {
     public const SCHEMA_MEDIA_TYPE = 'application/schema+json';
 
-    public const ERROR_NONE                    = 0x00000000;
-    public const ERROR_ALL                     = 0xFFFFFFFF;
-    public const ERROR_DOCUMENT_VALIDATION     = 0x00000001;
-    public const ERROR_SCHEMA_VALIDATION       = 0x00000002;
+    public const ERROR_NONE                    = 0;
+    public const ERROR_ALL                     = -1;
+    public const ERROR_DOCUMENT_VALIDATION     = 1;
+    public const ERROR_SCHEMA_VALIDATION       = 2;
 
     /**
      * Validates the given data against the schema and returns an object containing the results