fix qi_add_optional_package() when using qt with qmake
fix qi_add_optional_package() when using qt with qmake

Change-Id: Icb5a72a43e38403649a5c87a7c5840cad254d68a

dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild