xdvi figure rendering broken with gs 9.26

[Paul Vojta]

Here's the final (I hope) version of the patch.  This one correctly supports
printing PostScript error messages.

On Sat, Jul 13, 2019 at 05:20:51PM -0700, Paul Vojta wrote:
> On Fri, Jul 12, 2019 at 11:03:10PM -0700, Paul Vojta wrote:
> > On Fri, Jul 12, 2019 at 03:43:45PM -0600, Karl Berry wrote:
> > >     What do you think of xdvi using libgs sometime down the road?
> > > 
> > > In short, it's painful.
> > > 
> > > dvisvgm uses libgs. What we found is that, for TL, it must be dlopen()d
> > > at runtime; otherwise, the shared library dependency (and the induced
> > > dependency on libstdc++) makes the binary unusable on a plurality of
> > > systems. Whereas distros would like to link with the libgs/libstdc++
> > > that any particular release provides. You can see the lengths that
> > > Martin G and I have gone to deal with in the dvisvgm sources in TL.
> > > 
> > > So ... if there's any way to keep the interface at the PostScript level,
> > > that sounds a lot simpler to me. Is /execute et al. still available in
> > > some private dictionary or something, maybe? Or maybe the gs people
> > > would be willing to do that, since they said they were willing to "work
> > > with" application developers affected by the removal of all those
> > > operators.
> > > 
> > > Thanks,
> > > Karl
> > 
> > Here's a proposed fix.  I haven't tried it in xdvik, only in the non-k xdvi.
> > But it should work.
> > 
> > (This only fixes the more recent of the two bugs I mentioned.  I'm still
> > looking into the other one.)
> > 
> > Paul
> 
> Oops, the following would probably be better.
> 
> Paul
> 
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