Uses a similar trick to QtWebKit and moves linking of libudev to runtime
this ensures we can link against either libudev.so.0 or libudev.so.1
depending on which version the system has available.

Change-Id: I398af64b213b82f4d56d5591437dc6f9af4ad7ce
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>