Re: CC mode loads CL

[Richard Stallman]

    I personally believe that using `equal' as test is more useful than
    `eq'.  All current uses I am aware of in the Emacs code use `equal' as
    test.

We could add a function delete-duplicates that takes just one argument
and uses equal to compare.  Loading cl would extend this, just as
it extends dolist and dotimes.

Or we could call it delete-repeats.

Rather than make it accept a comparison function as argument,
I'd prefer to continue the distinction between delq and delete.
We could add delq-repeats if we ever need it.
This is more consistent with the rest of Emacs Lisp.