Remove fix for abstract single table inheritance base class

Author: mattleff

generator/lib/builder/om/PHP5ObjectBuilder.php

@@ -3864,12 +3864,6 @@ protected function addRefFKAdd(&$script, ForeignKey $refFK)
         $joinedTableObjectBuilder = $this->getNewObjectBuilder($refFK->getTable());
         $className = $joinedTableObjectBuilder->getObjectClassname();
 
-        if ($tblFK->getChildrenColumn()) {
-            $className = 'Base' . $className;
-            $namespace = $joinedTableObjectBuilder->getNamespace();
-            $this->declareClass($namespace . '\\' . $className);
-        }
-
         $collName = $this->getRefFKCollVarName($refFK);
 
         $scheduledForDeletion = lcfirst($this->getRefFKPhpNameAffix($refFK, $plural = true)) . "ScheduledForDeletion";