bug#37837: [PATCH] Make sb-image.el obsolete

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Sun, 20 Oct 2019 22:28:40 +0200
> 
> sb-image.el says:
> 
> ;; Supporting Image display for Emacs 20 and less, Emacs 21, and XEmacs,
> ;; is a challenging task, which doesn't take kindly to being byte compiled.
> ;; When sharing speedbar.elc between these three applications, the Image
> ;; support can get lost.
> ;;
> ;; By splitting out that hard part into this file, and avoiding byte
> ;; compilation, one copy speedbar can support all these platforms together.
> 
> I suggest to get rid of this compatibility kludge.  Is the attached
> patch an acceptable way to do that?

Did we decide to drop support of those older Emacs versions?