bug#28236: 'configure --with-cairo' causes 'emacs -font' to fail

[Eli Zaretskii]

> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Tue, 11 Dec 2018 03:50:06 +0200
> 
> On 25.08.2017 22:57, andrei.elkin@pp.inet.fi wrote:
> >    bash# src/emacs -Q -font 7x14
> >    => Font ‘7x14’ is not defined
> 
> FWIW, I can confirm with the latest emacs-26 and master.

Thanks for trying.  AFAIU, this is an important user-level feature, so
we should try fixing it if we want to enable Cairo by default.