MAGETWO-46939: Eliminate redundant module dependancies

Author: Stanislav Idolov

lib/internal/Magento/Framework/Setup/ExternalFKSetup.php

@@ -101,8 +101,7 @@ protected function getForeignKeys(
             $foreignKeys,
             function ($key) use ($targetColumn, $refTable, $refColumn) {
                 return $key['COLUMN_NAME'] == $targetColumn
-                && $key['REF_TABLE_NAME'] == $refTable
-                && $key['REF_COLUMN_NAME'] == $refColumn;
+                && $key['REF_TABLE_NAME'] == $refTable;
             }
         );
         return $foreignKeys;