D21363: Fix build with poppler < 0.51

[Albert Astals Cid]

aacid added a comment.


  In D21363#469750 <https://phabricator.kde.org/D21363#469750>, @volkov wrote:
  
  > My OS (AstraLinux) is based on Debian stretch and has poppler 0.48, Qt 5.11, KF5 5.46.
  >  And probably it will be a headache to update poppler on it, cause it's rather low-level library (cups-filters depends on it).
  
  
  Is there a astralinux docker image i could use?

REPOSITORY
  R223 Okular

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

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