Qt: Fix some build issues with non-SDL build

src/platform/qt/InputController.cpp

@@ -15,6 +15,7 @@
 #include <QWidget>
 
 extern "C" {
+#include "core/interface.h"
 #include "util/configuration.h"
 }
 

src/platform/qt/InputController.h

@@ -22,6 +22,9 @@ extern "C" {
 #endif
 }
 
+struct mRotationSource;
+struct mRumble;
+
 namespace QGBA {
 
 class ConfigController;

src/platform/qt/Window.h

@@ -14,6 +14,7 @@
 #include <functional>
 
 extern "C" {
+#include "core/thread.h"
 #include "gba/gba.h"
 }