Fixed regression in OStatus sub from WebFinger/XML_XRD update

XML_XRD::getAll requires arguments (at least relation). If one really
want all links, just get the 'links' array. It's public!

Also, not all XML_XRD_Element_Link were migrated from the previous
array style.

plugins/OStatus/lib/discoveryhints.php

@@ -24,7 +24,7 @@ class DiscoveryHints {
     {
         $hints = array();
 
-        foreach ($xrd->getAll() as $link) {
+        foreach ($xrd->links as $link) {
             switch ($link->rel) {
             case WebFinger::PROFILEPAGE:
                 $hints['profileurl'] = $link->href;