D17803: Fix build with poppler 0.71

Wed Dec 26 10:38:46 GMT 2018

vkrause added a comment.

  Which poppler version do you have? the getCString -> c_str rename is only in 0.72.

REPOSITORY
  R1003 KItinerary: Travel Reservation handling library

REVISION DETAIL
  https://phabricator.kde.org/D17803

To: nicolasfella, vkrause
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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