Since the dx tool has moved in the SDK, we need to update our copy
of it to also search in the new location for dx.jar.

Task-number: QTBUG-31405
Change-Id: If093a9f51f33c5d8666919f516a3b336322a7169
Reviewed-by: Ray Donnelly <mingw.android@gmail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>