D11505: Plan: fix build with Qt 5.6

[Wolfgang Bauer]

wbauer added a subscriber: Calligra-Devel-list.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D11505

To: wbauer, danders
Cc: Calligra-Devel-list, cochise, vandenoever