Add missing Qt includes.

Bug: https://bugs.gentoo.org/563574

--- a/src/configurationdata.cpp
+++ b/src/configurationdata.cpp
@@ -25,6 +25,7 @@
 #include <shlobj.h>
 #endif
 
+#include <QDataStream>
 #include <QDir>
 #include <cstdlib>
 
--- a/src/fractalgenerator.h
+++ b/src/fractalgenerator.h
@@ -21,6 +21,7 @@
 
 #include <QEvent>
 #include <QMutex>
+#include <QObject>
 #include <QWaitCondition>
 
 #include "abstractjobprovider.h"