QtQuick.Dialogs.Private needs classname in its qmldir
QtQuick.Dialogs.Private needs classname in its qmldir

Add classname entry to qmldir, otherwise qmlimportscanner cannot
utilize it when doing static builds (on iOS).  (same as change
6dbb25f944249f7b846be8b4d77165f054c5483f in qtdeclarative)

Task-number: QTBUG-35369
Change-Id: Id4dcd3e2193cd9f76db72f3244b1bde39a0d1a63
Reviewed-by: Liang Qi <0f3d3d9587f4f01263b2640b7eef7a92a160ec94@digia.com>

mizukusak/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols