Qbs: Actually emit signal that parsing started

The logic to disable building depends on this signal.

Change-Id: I2341ddb70eebeb25c8c4ffdbbb1e5a83945fb971
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -385,6 +385,8 @@ void QbsProject::parse(const QVariantMap &config, const QString &dir)
             this, SLOT(handleQbsParsingTaskSetup(QString,int)));
     connect(m_qbsSetupProjectJob, SIGNAL(taskProgress(int,qbs::AbstractJob*)),
             this, SLOT(handleQbsParsingProgress(int)));
+
+    emit projectParsingStarted();
 }
 
 void QbsProject::prepareForParsing()