bug#38835: 27; Recreated *scratch* buffer has lexical-binding = nil

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Mon, 13 Jan 2020 14:57:29 +0100
> Cc: 38835@debbugs.gnu.org
> 
> > Or maybe we should decide that lisp-interaction-mode should do this
> > for any buffer?
> 
> Yes, that seems to be the best and simplest choice.  Patch OK for emacs-27?

Yes, but this needs a NEWS entry, and please see if we say enough
about lisp-interaction-mode and/or lexical-binding to mention this in
the manual as well.

Thanks.