FIX #3548 : API not working after removing Composer

htdocs/api/restler.php

+<?php
+// use the restler auto loader
+require_once DOL_DOCUMENT_ROOT.'/includes/restler/framework/Luracast/Restler/AutoLoader.php';
+return call_user_func(function () {
+    $loader = Luracast\Restler\AutoLoader::instance();
+    spl_autoload_register($loader);
+    return $loader;
+});
\ No newline at end of file

htdocs/public/api/index.php

@@ -31,7 +31,7 @@ $res=0;
 if (! $res && file_exists("../../main.inc.php")) $res=include '../../main.inc.php';
 if (! $res) die("Include of main fails");
 
-require_once DOL_DOCUMENT_ROOT.'/includes/autoload.php';
+require_once DOL_DOCUMENT_ROOT.'/api/restler.php';
 require_once DOL_DOCUMENT_ROOT.'/api/class/api.class.php';
 require_once DOL_DOCUMENT_ROOT.'/api/class/api_access.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';