D9253: Make Plan build on Windows

[Dan Leinir Turthra Jensen]

leinir added a subscriber: Calligra-Devel-list.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D9253

To: leinir, #calligra:_3.0, danders
Cc: Calligra-Devel-list, cochise, vandenoever