Fix lupdate-warning about missing Q_OBJECT in CppIncludeHierarchyModel.

Change-Id: Ieac6d4d741813a14f070b912bdefab843d2f728e
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cppeditor/cppincludehierarchymodel.h

@@ -48,6 +48,7 @@ class CppIncludeHierarchyItem;
 
 class CppIncludeHierarchyModel : public QAbstractItemModel
 {
+    Q_OBJECT
 public:
     explicit CppIncludeHierarchyModel(QObject *parent);
     ~CppIncludeHierarchyModel();