Fix Export item documentation.

There were some references to "product module" left.

Change-Id: I0217e375aa387298e0c32811608a33ffc7ee9a75
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Fix "qbs clean" autotest on Windows.

The usual problem about mising lib file due to no exported
symbols.

Change-Id: Idce4afc9e451a507894b71b18084b0aef9989837
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>