Summary:
On build.kde.org all tests loading scripted effects are failing. This
seems to be because the effects are not installed.
To make this work, this change introduces the following changes:
* scripted effects are copied to ${build}/bin, like all binaries
* the test sets XDG_DATA_DIRS env variable to point to ${build}/bin
This change also needs to be added to further tests once this is
accepted. Furthermore it could be considered whether KPackageLoader
should consider the QCoreApplication::applicationDirPath in addition to
the GenericDataLocation. This would make KPackageLoader work much better
in a build tree only setup.
Test Plan: Test passes locally, obviously not tried on build.kde.org
Reviewers: #kwin
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D16682
