D22581: Add option to build Qt Designer plugin (BUILD_DESIGNERPLUGIN, default ON)

[Aleix Pol Gonzalez]

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

REPOSITORY
  R300 KDEWebKit

BRANCH
  adddesignerpluginbuild

REVISION DETAIL
  https://phabricator.kde.org/D22581

To: kossebau, apol
Cc: kde-frameworks-devel, LeGast00n, sbergeron, michaelh, ngraham, bruns