Add |> and @@ operators to Pervasives

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13739 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#3963: Graphics.wait_next_event in Win32 hangs if window closed

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13740 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02