Remove deprecated param from buildSortingSQL

Author: Alexandra Nantel

fields/field.selectbox_link.php

@@ -962,7 +962,7 @@ private function getRelatedFieldsId() {
             return explode(',', $related_field_id);
         }
 
-        public function buildSortingSQL(&$joins, &$where, &$sort, $order='ASC', &$select = NULL){
+        public function buildSortingSQL(&$joins, &$where, &$sort, $order='ASC'){
             if(in_array(strtolower($order), array('random', 'rand'))) {
                 $sort = 'ORDER BY RAND()';
             }
@@ -995,6 +995,11 @@ public function buildSortingSQL(&$joins, &$where, &$sort, $order='ASC', &$select
             }
         }
 
+        public function buildSortingSelectSQL($sort, $order = 'ASC')
+        {
+            return null;
+        }
+
     /*-------------------------------------------------------------------------
         Grouping:
     -------------------------------------------------------------------------*/