bug#74606: 31.0.50; Another rsvg API change

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: Eli Zaretskii <eliz@gnu.org>,  74606-done@debbugs.gnu.org
> Date: Mon, 02 Dec 2024 15:14:54 +0100
> 
> > On this page, when you unfold the link "Tags containing commit", you can
> > see that 2.58.90 is the first one.  So maybe, I should use this version
> > instead.  WDYT?
> >
> > The "Deprecated: 2.58" from the header looks like a copy/paste
> > mistake.
> 
> Here is a patch to be applied on emacs-30.

Thanks, but did you verify that 2.58.90 actually has this function?
Is the tarball of that version's sources available somewhere we could
check?

Alternatively, we could use 2.59, since 2.58.90 is a pretest, so I see
no catastrophe if someone sees warnings while using it.