bug#66636: Move lexical-binding warning from checkdoc to byte-compiler

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Fri, 20 Oct 2023 19:40:02 +0200
> Cc: Po Lu <luangruo@yahoo.com>,
>  66636@debbugs.gnu.org,
>  Stefan Kangas <stefankangas@gmail.com>,
>  Eli Zaretskii <eliz@gnu.org>
> 
> Looks like there are no serious objections so the changes will be pushed 
> soon, probably some time tomorrow.

Really?  Is that what you deduced from the messages posted about this
change?  Did you see what Po Lu and I said?  What is your response to
that?