QmlDesigner: Make ItemLibraryEntry known to qml

Change-Id: I1201739e099425bcac3a5b209ca1bdf3573c3223
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/designercore/include/itemlibraryinfo.h

@@ -34,7 +34,7 @@
 
 #include "propertycontainer.h"
 #include <QPointer>
-
+#include <qqml.h>
 
 namespace QmlDesigner {
 
@@ -124,4 +124,5 @@ private: // variables
 
 } // namespace QmlDesigner
 
+QML_DECLARE_TYPE(QmlDesigner::ItemLibraryEntry)
 #endif // ITEMLIBRARYINFO_H