bug#39663: [External] : bug#39663: 27.1; ebnf2ps bugs

[Drew Adams]

> > Although it could still be useful, the ebnf2ps package does show its
> > age in many respects: non-Unicode, output in EPS rather than PDF or
> > SVG, no interactive preview, etc. It's also misplaced (in 'progmodes'
> > despite not being a programming mode) and, in effect, abandoned. Does
> > it really belong in Emacs core?
> >
> > (And does anyone use railway diagrams these days?)

Yes, docs still use railroad diagrams.
And BNF (lots of flavors).

And EPS figures are still used in
technical doc production (of PDFs).