* gnu/packages/kde.scm (qjson): Move from here...
* gnu/packages/qt.scm (qjson): ...to here.
* gnu/packages/pumpio.scm: Drop inclusion of (gnu packages kde).
* gnu/packages/kde.scm: Delete file.
* gnu-system.am (GNU_SYSTEM_MODULES): Unregister it.
* gnu/packages/rdf.scm (soprano): Delete variable.
KDE 4 relies on Qt 4, which does not receive security updates any more.