Do declare right metatype for Qt4

src/libtomahawk/utils/NetworkReply.h

@@ -61,6 +61,8 @@ private:
     QUrl m_url;
 };
 
-Q_DECLARE_METATYPE( QSharedPointer<NetworkReply> )
+#if QT_VERSION < QT_VERSION_CHECK( 5, 0, 0 )
+    Q_DECLARE_METATYPE( NetworkReply* )
+#endif
 
 #endif // NETWORKREPLY_H