Revert "Add verbose output from disk space usage during Qt5 builds"

This reverts commit c5ead893122c21fb2643d8b0f1647c124ce71a57

Caused problems on Mac and Windows

Change-Id: I468c485043765b85a98c6e732f62bb68f2c599e6
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>