Add patchpack info and website to about window.

src/widgets/misc_widget.h

@@ -26,6 +26,8 @@ enum ToolTipsWidgets {
 enum AboutWidgets {
 	WID_A_SCROLLING_TEXT, ///< The actually scrolling text.
 	WID_A_WEBSITE,        ///< URL of OpenTTD website.
+	WID_A_WEBSITE1,       ///< URL of patchpack thread.
+	WID_A_WEBSITE2,       ///< URL of patchpack github.
 };
 
 /** Widgets of the #QueryStringWindow class. */