`apply-partially' in subr.el is broken

[Miles Bader <miles.bader@necel.com>]

A recent change to subr.el uses a cl macro (lexical-let):

   2008-10-19  Eli Zaretskii  <eliz@gnu.org>

           * subr.el (apply-partially): Moved here from minibuffer.el.

apply-partially looks like:

   (defun apply-partially (fun &rest args)
     ...
     (lexical-let ((fun fun) (args1 args))
     ...

but subr.el does not have (eval-when-compile (require 'cl)).

Naturally, this does not compile correctly.

So either the require needs to be added or apply-partially needs to not
use lexical-let (is it ok for subr.el to use cl.el?).

Thanks,

-Miles

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