D12672: Use a target in FindDiscount (modern cmake) rather than variables

[Aleix Pol Gonzalez]

apol accepted this revision.
apol added a comment.
This revision is now accepted and ready to land.


  It's actually fixing the build when discount is in its own prefix.
  
  Also I agree that it's better using targets.

REPOSITORY
  R223 Okular

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D12672

To: svuorela, kde-buildsystem, apol
Cc: apol, aacid, #okular, ngraham
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