D21320: Fix build with poppler < 0.51

[Joao Oliveira]

joaonetto added a comment.


  This broke the compilation process on my machine. I just tested with a clean version of KDE Neon, Poppler 0.62, and it doesn't compile, something about FormFieldsSignatures.
  
  Is this only happening to me?

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D21320

To: volkov, #okular, sander
Cc: joaonetto, okular-devel, tfella, ngraham, darcyshen, aacid
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