TeX Live 2019 wanted

[Marius Bakke]

Greetings Guix,

The latest version of the popular Poppler PDF library (slated for the
'core-updates' branch) unsurprisingly[0][1][2] breaks 'texlive-bin'.

Previously we were able to rely on the work of other distributions, but
most have moved on to 2019 by now.  And the required changes now are
more intrusive than previously.

The main problem is that LuaTeX upstream has removed the Poppler
dependency entirely in favor of a smaller library, so no upstream fixes
are available:

https://github.com/TeX-Live/texlive-source/commit/aa5363bd0dc180752c7d8eb9d847c2581e453b1a

I *believe* this commit should be safe to backport as it predates the
2019 changes in the affected directories, but that requires some work
too.  It would be much better to update the shebang to 2019.

Ricardo, do you think you'll have time for a TeX Live 2019 update in the
coming weeks?  If not, could you outline the required changes for
enterprising Guix contributors?

TIA!

[0] 
https://git.savannah.gnu.org/cgit/guix.git/commit/?id=143fc1a591c552b0464674cfebf8de63bdde7461
[1] 
https://git.savannah.gnu.org/cgit/guix.git/commit/?id=9df397508dc1bc3544534aebc7c658c9754b08b4
[2] 
https://git.savannah.gnu.org/cgit/guix.git/commit/?id=c078f1b08b844c7126db2a4a0f83db2217e3bb0f

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