bug#61707: Remove function-alias-p NOERROR argument

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Wed, 22 Feb 2023 14:44:21 +0100
> Cc: Eli Zaretskii <eliz@gnu.org>
> 
> `function-alias-p` is new in Emacs 29, and takes an optional NOERROR argument 
> which has become entirely useless in Emacs 30 where it is only present for 
> compatibility.
> 
> Given that the NOERROR argument is not very useful in Emacs 29 either, what 
> about removing it in that version as well? After all, rather silly to 
> introduce something that's known to go away the next release.
> 
> Proposed patch attached.

Lars added this function, so it would be prudent to ask him.

My opinion is that it's too late for such changes: this function is
with us for more than a year, so I guess we will have to live with
optional argument even if it's useless in Emacs 30 and later.