D10415: Fix realDpi function for Mac

[Albert Astals Cid]

aacid closed this revision.

REPOSITORY
  R223 Okular

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

To: sbragin, #okular, rjvbb
Cc: rjvbb, cullmann, aacid, kde-mac, ltoscano, #okular, michaelweghorn, 
ngraham, simgunz