D11122: Fix webenginemessageviewer with Qt 5.11

[Laurent Montel]

mlaurent accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R94 PIM: Message Library

BRANCH
  Applications/17.12

REVISION DETAIL
  https://phabricator.kde.org/D11122

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