Debugger: Remove linebreak in warning message.

QMessageBox does line wrapping automatically.

Change-Id: I899cc9f99e172423b58874216c83591c10264f6e
Reviewed-by: hjk <hjk121@nokiamail.com>
Qbs: Remove some dead code

Change-Id: I94fee7575bb39721391da2c0f5df669172b71028
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>