comm: Add missing QObject include for QGCMAVLink

It's necessary to include QOBject to inherit
Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/comm/QGCMAVLink.h

@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <QObject>
 #include <QString>
 #include <QList>