D28182: Fix compilation with Qt 5.15

[Albert Astals Cid]

aacid added a subscriber: mlaurent.

REPOSITORY
  R168 Kleopatra

REVISION DETAIL
  https://phabricator.kde.org/D28182

To: aacid
Cc: mlaurent, arojas, kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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