D11117: Fix building with 5.11

[Laurent Montel]

mlaurent requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R91 PIM: Sieve Handling Library

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

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