Reduce use of cl in lisp/emacs-lisp/.

Reduce use of cl in lisp/emacs-lisp/.
* lisp/emacs-lisp/timer.el, lisp/emacs-lisp/syntax.el, lisp/emacs-lisp/smie.el:
* lisp/emacs-lisp/ewoc.el, lisp/emacs-lisp/cconv.el,lisp/emacs-lisp/derived.el:
* lisp/emacs-lisp/byte-opt.el, lisp/emacs-lisp/autoload.el: Convert to cl-lib.
* lisp/emacs-lisp/easymenu.el, lisp/emacs-lisp/easy-mmode.el:
* lisp/emacs-lisp/bytecomp.el: Use pcase instead of `cl'.
* lisp/emacs-lisp/cl-lib.el: Get rid of special cl-macs auto load.