create the whole plugin structure in the build directory
Summary:
when building copy all qml files in build/org/kde/kirigami.2
as well generating the binary plugin there.
this is neccessary to be able to load and test the whole QML
import without installing it system wide
Test Plan:
after make, the hierarchy under build is complete with the same files
that end up being installed
Reviewers: Kirigami, dfaure, sitter, apol
Reviewed By: apol
Subscribers: apol, plasma-devel
Tags: Kirigami
Differential Revision: https://phabricator.kde.org/D7794