after fixing the win32unix/select bug, remove the workaround

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14376 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
now it's sed versions that behave differently :-(

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14377 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02