Add php-xml as dependency for core fix oc-364

apps/admin_dependencies_chk/settings.php

@@ -68,6 +68,12 @@ $modules[] =array(
 	'modules'=> array('core'),
 	'message'=> $l->t('The php-ctype module is needed validate data.'));
 
+$modules[] =array(
+	'status' => class_exists('DOMDocument') ? 'ok' : 'error',
+	'part'=> 'php-xml',
+	'modules'=> array('core'),
+	'message'=> $l->t('The php-xml module is needed to share files with webdav.'));
+
 $modules[] =array(
 	'status' => ini_get('allow_url_fopen') == '1' ? 'ok' : 'error',
 	'part'=> 'allow_url_fopen',