Removing non `loop' features from cl.el - `cl-map-overlays', `cl-map-intervals', `cl-map-extents'

[Stephen J. Turnbull]

MON KEY writes:
 > cl.el defines `cl-map-extents' as:
 > 
 > (defun cl-map-extents (&rest cl-args)
 >   (apply 'cl-map-overlays cl-args))

Presumably this function is for compatibility with code written for
XEmacs.  I don't see why anybody using GNU Emacs would need it.