bug#33748: 27.0.50; harfbuzz branch fails to compile

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  behdad@behdad.org,  33748@debbugs.gnu.org, 
>  far.nasiri.m@gmail.com
> Date: Sat, 15 Dec 2018 12:50:59 -0500
> 
> Khaled Hosny wrote:
> 
> >> Which oldest version of HarfBuzz would you prefer us to require?  Is
> >> 0.9.42 OK, or do we need a newer one?
> >
> > I'd prefer the latest version of course, there have been lots of bug
> > fixes and new features since then.
> 
> Right, but that doesn't answer the question.

I think it does:

>                                    If one is building his own HarfBuzz,
> then definitely the latest version, otherwise the one that comes with
> the system is good enough (Emacs wouldn’t be disadvantaged anymore than
> any HarfBuzz-using application on the said system), as long as it has
> the APIs we use.

The last part, in my interpretation, means 0.9.42 is "good enough",
since it has the APIs used by the code.