D11117: Fix building with 5.11

[Allan Sandfeld Jensen]

carewolf created this revision.
carewolf added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
carewolf requested review of this revision.

REVISION SUMMARY
  Don't tell Qt to remove API we might be using and which wasn't depecated when we wrote the code.

REPOSITORY
  R91 PIM: Sieve Handling Library

REVISION DETAIL
  https://phabricator.kde.org/D11117

AFFECTED FILES
  CMakeLists.txt

To: carewolf, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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