Fixes to the About dialog & add the SystemInfo dialog.

Also fix the build on Mac OS X.

Source/Core/DolphinQt/SystemInfo.h

@@ -0,0 +1,31 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+
+namespace Ui
+{
+class DSystemInfo;
+}
+
+class DSystemInfo : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit DSystemInfo(QWidget* parent_widget = nullptr);
+	~DSystemInfo();
+
+private slots:
+	void btnCopy_pressed();
+
+private:
+	std::unique_ptr<Ui::DSystemInfo> m_ui;
+
+	void UpdateSystemInfo();
+	QString GetOS();
+};