ZP-1374 Add imap backend location to the include_path when using imap

backend.

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/imap/imap.php

@@ -35,7 +35,7 @@ require_once("backend/imap/user_identity.php");
 // Add the path for Andrew's Web Libraries to include_path
 // because it is required for the emails with ics attachments
 // @see https://jira.z-hub.io/browse/ZP-1149
-set_include_path(get_include_path() . PATH_SEPARATOR . '/usr/share/awl/inc');
+set_include_path(get_include_path() . PATH_SEPARATOR . '/usr/share/awl/inc' . PATH_SEPARATOR . dirname(__FILE__) . '/');
 
 class BackendIMAP extends BackendDiff implements ISearchProvider {
     private $wasteID;