Add absolute paths to environment.

Change-Id: I0f23f8d372f3ceb3d4af301196e6fdea5f969998
Reviewed-on: http://codereview.qt.nokia.com/2819


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>