bug#40800: 27.0.90; Incorrect external definition for calc-twos-complement-mode

[Hugh Daschbach]

Mattias Engdegård writes:

> Thank you! It seems that calc-twos-complement-mode is a 
> variable, not a function, and there were more autoloads that 
> didn't correspond to actual functions. Would this patch work for 
> you?
>
> (By the way, how come you found this mistake?)

That does work, thank you.  Moreover, (fboundp 
'calc-twos-complement-mode) now returns nil.

I ran into this trying to generate a list of functions with an 
arity of zero, with:

(completing-read
    "Function: "
    (let (fns)
      (mapatoms
        (lambda (x)
          (when (and (fboundp x)
                    (= 0 (car (func-arity x))))
            (push (symbol-name x) fns))))
      fns)
    nil t nil 'local/mapcar-dired-history)

Still need to ignore autoloaded functions, as I don't want 
func-arity to cause the function to be loaded.  But that's where I 
started.

Many thanks.
Hugh