qt: Compatibility improvements

* Patch to build with Qt 5.11 and later by jriwanek
* Attempt to fix viewport on hardware renderers

src/qt/qt_renderercommon.hpp

@@ -7,6 +7,7 @@
 #include <vector>
 #include <tuple>
 #include <atomic>
+#include <memory>
 
 class QWidget;