CppEditor: Fix Qt4 compile

Change-Id: I3bad3687e06a5333359bd926cae2493f709aeff2
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cppeditor/cppincludehierarchy_test.cpp

@@ -40,6 +40,8 @@
 #include <QList>
 #include <QtTest>
 
+Q_DECLARE_METATYPE(QList<QByteArray>)
+
 using namespace CPlusPlus;
 using namespace CppEditor::Internal;
 using namespace CppTools;