DolphinQt: add warning if graphics mods are not enabled

Source/Core/DolphinQt/Config/GraphicsModWarningWidget.h

@@ -0,0 +1,28 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QWidget>
+
+class QLabel;
+class QPushButton;
+
+class GraphicsModWarningWidget final : public QWidget
+{
+  Q_OBJECT
+public:
+  explicit GraphicsModWarningWidget(QWidget* parent);
+
+signals:
+  void GraphicsModEnableSettings();
+
+private:
+  void CreateWidgets();
+  void ConnectWidgets();
+
+  void Update();
+
+  QLabel* m_text;
+  QPushButton* m_config_button;
+};