bug#41988: 28.0.50; Edebug unconditionally instruments definitions with &define specs

[Stefan Monnier]

>> +** The '&define' keyword in an Edebug specification now disables
>> +backtracking.
>
> Please add here a pointer to the ELisp manual where this is described,
> as the text otherwise is too terse to speak for itself.
>
> Also, the heading line should be a single complete sentence, and the
> NEWS entry should be marked "+++", since the manual is being updated
> by the same changeset.
>
> (I have no opinion on the change itself, although it strikes me as
> unusual to delete a feature rather than fix it.)

It's a "feature" that's been broken for ever, that noone knows how to
fix, and for which we know no current user.

Also the new `&name` can be useful to avoid the need for that feature,
so in a sense we did provide a kind of fix in the form of a new
alternative solution.


        Stefan