QbsProjectManager: Adapt to qbs API change.

qbs::logLevelTag() returns a QString now.

Change-Id: Iacd94a93bbadb30d624b9c458899921f0e72de66
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/qbsprojectmanager/qbslogsink.cpp

@@ -65,11 +65,10 @@ void QbsLogSink::sendMessages()
 void QbsLogSink::doPrintMessage(qbs::LoggerLevel level, const QString &message, const QString &tag)
 {
     Q_UNUSED(tag);
-    const QString fullMessage = QString::fromLocal8Bit(qbs::logLevelTag(level)) + message;
 
     {
         QMutexLocker l(&m_mutex);
-        m_messages.append(fullMessage);
+        m_messages.append(qbs::logLevelTag(level) + message);
     }
     QMetaObject::invokeMethod(this, "sendMessages", Qt::QueuedConnection);
 }