bug#24749: Making sure syntax-propertize is called

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 20 Oct 2016 17:14:40 -0400
> 
> Package: Emacs
> Version: 25.2.50
> 
> 
> Nowadays, syntax-propertize is automatically called ondemand by the sexp
> functions, but only if parse-sexp-lookup-properties is non-nil.
> See bug#4920 for an example of the problem and the fix we installed.
> 
> I suggest we install the patch below instead, so as to fix this bug in
> more/all major modes at once.

Since when does this issue exist?

The issue seems of rather low importance to me, so unless it's a
regression since Emacs 24.5, I think the fix should go to master, not
to the release branch.

Thanks.