Fix qbs build.

Change-Id: Ib0ef2c6a4f634902f3ff1f987b54fc112ae70940
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Debugger: Raise messagebox when cdb can't be started.

Task-number: QTCREATORBUG-10180

Change-Id: Iaf672c79a95c37fba2f5243db9564305de8e76dc
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>