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

[Stefan Monnier]

>> >> FWIW, I think this would be a disservice to them (and to ourselves).
>> >> In 99% of the cases it's just as easy to make the code work with
>> >> `lexical-binding:t`.
>> > I think we want to encourage whatever relieves users of the most work,
>> > not what comports best with some abstract conception of desirability.
>> 
>> For users it should make no difference, they don't need to do anything
>> (other than avert their eyes from the warning, maybe).
>
> You interpret "users" in what I wrote too narrowly, I think.

My reply is to Po Lu who seemed to use "users" in the sense of "non
developers" (indeed, this use surprised me as well).


        Stefan