D6990: Allow to build Sonnet without Qt5Widgets

[Volker Krause]

vkrause added a comment.


  Fair point, I'll add options for this.

REPOSITORY
  R246 Sonnet

REVISION DETAIL
  https://phabricator.kde.org/D6990

To: vkrause, #frameworks, cordlandwehr
Cc: aacid