Never run qmlplugindump on plugins that already offer plugins.qmltypes.
Summary: Should be the same content, less complications, less work to do.
Reviewers: KDevelop, mwolff
Reviewed By: KDevelop, mwolff
Subscribers: kdevelop-devel
Differential Revision: https://phabricator.kde.org/D10872
(cherry picked from commit c06ea4668c48fed8c63d63f16ccb5b0380fcb1ca)