D10415: Fix realDpi function for Mac

[Sergio Bragin]

sbragin edited the summary of this revision.
sbragin added a reviewer: Okular.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D10415

To: sbragin, #okular
Cc: ltoscano, #okular, michaelweghorn, ngraham, aacid