Remove excess parameters on cl--const-expr-val

Remove excess parameters on cl--const-expr-val

2014-04-21  Daniel Colascione  <dancol@dancol.org>

	* emacs-lisp/cl-macs.el (cl--const-expr-val): We didn't need the
	last two parameters after all.
	(cl--expr-contains,cl--compiler-macro-typep,cl--compiler-macro-member)
	(cl--compiler-macro-assoc,cl-struct-slot-value)
	(cl-struct-set-slot-value): Stop using them.