Remove the Qt4 dependency from IO agents

The IO agents do not depend on Qt so remove the
reference to Qt4e. Add a compile task to handle
compilation.

Signed-off-by: Jeff Horn <jhorn@reachtech.com>
Fix reach-image-x11-qt4 dependency on Qt4e

Remove packagegroup-reach-qml-viewer-qt4x11 from
the image as that created a dependency on Qt4e which
we don't need. The Qml Viewer and IO agents are added
manually instead of throught the package group. Revisit.

Signed-off-by: Jeff Horn <jhorn@reachtech.com>