Added a dummy Qt sis file and fixed paths in bld.inf.
Otherwise build would fail when FF_QT_IN_UDA is defined.
Dummy Qt sis file needs to replaced with a real one
when actual UDA image is created.
Task-number: QT-4888
Reviewed-by: Guoqing Zhang
(cherry picked from commit 6dcb0028e44cba2a00c2fb867fb1757ad5b1a254)
