Fix build of the new TWidgetHelper<> for GCC, finally.

Also fixed a char-related warning in codegen project.

Telegram/SourceFiles/ui/twidget.h

@@ -220,6 +220,9 @@ private:
 		return qobject_cast<const TWidget*>(Base::parentWidget());
 	}
 
+	template <typename OtherBase>
+	friend class TWidgetHelper;
+
 };
 
 class TWidget : public TWidgetHelper<QWidget> {
@@ -303,9 +306,6 @@ protected:
 		return height();
 	}
 
-	template <typename Base>
-	friend class TWidgetHelper;
-
 };
 
 template <typename Widget>