D25644: kitinerary: fix compilation with poppler >= 0.83

[David Faure]

dfaure created this revision.
dfaure added reviewers: vkrause, aacid.
Herald added a project: KDE PIM.
Herald added a subscriber: kde-pim.
dfaure requested review of this revision.

REVISION SUMMARY
  state->getPath() now returns a const GfxPath, and the methods
  we are calling on it are indeed const now.
  
  But they were not const before, so we can't just use const
  unconditionally here, hence the version check and the #define.

TEST PLAN
  Builds

REPOSITORY
  R1003 KItinerary: Travel Reservation handling library

BRANCH
  release/19.12

REVISION DETAIL
  https://phabricator.kde.org/D25644

AFFECTED FILES
  src/pdf/popplerutils.cpp
  src/pdf/popplerutils_p.h

To: dfaure, vkrause, aacid
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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