Squish: Fix verifyBuildAndRun()

"The program has unexpectedly finished." is considered valid output,
see https://bugreports.qt-project.org/browse/QTCREATORBUG-9212

Change-Id: Ia18e2dcfccdf1bdfbbc793a01897a88c4a17eb40
Reviewed-by: Christian Stenger <christian.stenger@digia.com>