(eshell-plain-locate-behavior): Make the default the return value of `eshell-under-xemacs-p', ie, nil for GNU/Emacs and non-nil for XEmacs.
(eshell-plain-locate-behavior): Make the default the return value of `eshell-under-xemacs-p', ie, nil for GNU/Emacs and non-nil for XEmacs.