D12342: Update CMakeLists.txt

[Michael Heidelbach]

michaelh added a reviewer: elvisangelaccio.

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D12342

To: michaelh, #baloo, #dolphin, #frameworks, elvisangelaccio
Cc: ashaposhnikov, astippich, spoorun