D9892: cmake: Use the official CMake variable for building as a static plugin.

[Marco Martin]

mart added a comment.


  now the library definition is not duplicated
  and both the cmake and qmake example do usa the static plugin

REPOSITORY
  R169 Kirigami

REVISION DETAIL
  https://phabricator.kde.org/D9892

To: mart, #kirigami, lepagevalleeemmanuel
Cc: apol, plasma-devel, davidedmundson, mart, hein