Bug#718264: luatex has unused build-deps on poppler libraries

[Pino Toscano <pino@debian.org>]

Source: luatex
Followup-For: Bug #718264

Hi,

since a couple of days there's poppler 0.22.5 available in unstable,
so luatex could switch back using an external poppler (and make the
poppler-related build dependencies useful again).

Note that having a note about the particular version requirements could
help; also the too old version was due to the previous lack of
maintainership (and then the freeze kicked in), which I'm trying to
address.

-- 
Pino