[patch] XEmacs 21.2.20 executable-find sync-up with Emacs

In Emacs, executable-find add implicit extensions ".exe" ".com" ".bafind in win32 The patch syncs up the exectable.el with Emacs 20.4. Hope I patched the right version. (How do I know that I have the latest xemacs-packages?) jari (emacs-version)"XEmacs 21.2 (beta20) \"Yoko\" [Lucid] (i586-pc-win32) of Fri Nov 12 1999 on NEVERYON" `executable-find' is a Lisp function -- loaded from "e:\usr\local\bin\emacs\XEmacs\xemacs-packages\lisp\sh-script\executable.el" (executable-find COMMAND)