* fhandler.h (fhandler_base::cleanup): Mark as extern rather than inline.

* fhandler_base.cc (fhandler_base::cleanup): Define.
* fhandler_tty.cc (fhandler_pty_slave::cleanup): Call fhandler_base::cleanup.
(fhandler_pty_master::cleanup): Ditto.

winsup/cygwin/fhandler.cc

@@ -1109,6 +1109,11 @@ fhandler_base::close_with_arch ()
   return res;
 }
 
+void
+fhandler_base::cleanup ()
+{
+}
+
 int
 fhandler_base::close ()
 {