Add distro-logo.patch used by Fedora and Ubuntu

This patch is used by Ubuntu and Fedora (with minor changes). I think the intent is for it to be pushed upstream but I guess it's stalled by having an easy way to look up the distro logo name.

I think this patch is fine. The only string added is GNOME and I think we're ok with that being untranslated. It's going to be a bit of a nuisance for any Debian derivatives that don't use the Debian logo though.

The distro name comes from the PRETTY_NAME in /etc/os-release (that wasn't changed in this patch).