Add missing includes

src/core/tagcache.h

@@ -8,6 +8,8 @@
 
 #include "akonadicore_export.h"
 
+#include <QObject>
+
 #include <Akonadi/Tag>
 
 #include <memory>

tests/libs/itemdumper.h

@@ -10,6 +10,7 @@
 #include "collection.h"
 
 #include <QElapsedTimer>
+#include <QObject>
 
 class KJob;