Canonicalize architecture in probes.

Change-Id: I073396c3012a2e8e58dbaffdce151a12d16fd3de
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
introduce TestBlackbox::unifiedLineEndings()

unifiedLineEndings removes all \r characters from a QByteArray and
returns a modified copy. Use this function to unify the output from
QProcess on Windows.

Change-Id: I414230602dea0f12d171620520e72547c2939881
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>