[tex-live] [Patch] XeTeX - Avoid modification of internal poppler object, fix compilation with poppler 0.72

[Karl Berry]

    from poppler to pplib also for XeTeX and pdfTeX :)

That's the wish, yep. And when Luigi says pplib is ready (probably not
for 2019, aside from luatex), I think it will not be too onerous. -k