QUiLoader/Designer: Fix gcc 4.8 warnings about unused typedefs.

Change-Id: I792f3060c808ef860b31b47b3b00e5ac1991eedd
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>
(cherry picked from qttools/3455a96c6728873a3ba69585ebb27bf8e733c0f9)