add explicit QDebug include in PollServer
https://bugs.gentoo.org/869395
--- a/libraries/katabasis/src/PollServer.cpp
+++ b/libraries/katabasis/src/PollServer.cpp
@@ -1,6 +1,8 @@
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
 
+#include <QDebug>
+
 #include "katabasis/PollServer.h"
 #include "JsonResponse.h"
 
-- 
2.37.3