D21363: Fix build with poppler < 0.51

[Alexander Volkov]

volkov added reviewers: Okular, sander.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D21363

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