Add Qt version switch

Package-Manager: portage-2.2.7
[kde-base/gwenview] Fix DEPEND by upstream changes

Package-Manager: portage-2.2.8-r1
Merge pull request #13 from xhochy/jreen-qt5

Thanks
[kde-base/kjots] Fix build wrt bug #503966.

Package-Manager: portage-2.2.8-r1
[kde-base/knotes] Fix build.

Package-Manager: portage-2.2.8-r1
[kde-base/kmail] Fix build wrt bug #503964.

Package-Manager: portage-2.2.8-r1
[kde-base/konsolekalendar] Fix build.

Package-Manager: portage-2.2.8-r1
[kde-misc/kdeconnect] Sync.

Package-Manager: portage-2.2.8-r1