[WITH_BDB2] (mu_dbm_firstkey): db->cursor

takes three or four arguments, depending on the release
of DB 2. Take care of it.

@@ -266,7 +266,7 @@ mu_dbm_firstkey (DBM_FILE db)
 
 
   if (!db->dbc)
   if (!db->dbc)
     {
     {
-      if (db->db->cursor(db->db, NULL, &db->dbc, 0) != 0)
+      if (db->db->cursor(db->db, NULL, &db->dbc BDB2_CURSOR_LASTARG) != 0)
 	return key;
 	return key;
     }
     }