bug#58021: 29.0.50; Remove old font.c code

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Date: Fri, 23 Sep 2022 11:11:22 +0200
> 
> Here is patch that removes some old "#if 0" code from font.c.  Most of
> this code seems to be "#if 0" since 2006 (when font.c was introduced)
> and was only "updated" for overall interfaces change.
> 
> Maybe it was kept as hints for future readers but I found this code to
> be a bit misleading as it has drifted along from how things are actually
> done now.

FWIW, I see no reason to remove this.  Someone someday may decide to
implement these ideas.