Make sure Linux packages have no libudev dependency

Newer distributions tend to offer libudev.so.1 only, while the
current build machines link against libudev.so.0. Avoid these pitfalls
by explicitly disabling libudev at configure time.

Task-number: QTBUG-34176
Change-Id: I5f74046def7a7008cffaa6f14376e397fb08df4e
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>