Allow to create own entrypoint / index.php with unmodified z-push sources

If you use composer or upstream git repo as sub-project you cant modify config.php to your needs.
Patch allows to create an own index.php as follows:
<?php
define('ZPUSH_CONFIG', __DIR__.'/config.php');
$_SERVER['SCRIPT_FILENAME'] = realpath(__DIR__.'/../vendor/zarafa/zpush2/index.php');
chdir('../vendor/zarafa/zpush2');
include('../vendor/zarafa/zpush2/src/index.php');

src/index.php

@@ -120,7 +120,8 @@ include_once('lib/default/searchprovider.php');
 include_once('lib/request/request.php');
 include_once('lib/request/requestprocessor.php');
 
-include_once('config.php');
+if (!defined('ZPUSH_CONFIG')) define('ZPUSH_CONFIG', 'config.php');
+include_once(ZPUSH_CONFIG);
 include_once('version.php');