bug#21584: 25.0.50; Please add cl-constantly function from Common Lisp

[Lars Ingebrigtsen]

Mark Karpov <markkarpov@openmailbox.org> writes:

> In Common Lisp there is ‘constantly’ function:
>
>   http://www.lispworks.com/documentation/HyperSpec/Body/f_cons_1.htm
>
> which creates new function without side-effects that takes any number of
> arguments and always returns specified value.
>
> For some reason ‘cl-lib’ doesn't provide ‘cl-constantly’, so I guess it
> should exist in pure Emacs Lisp under different name.

I've now added `cl-constantly' to Emacs 29.

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