QmakeProjectManager: Improve signalling of parser state

Correctly signal when parsing of a qmake project starts and stops via
the build- and runconfigurations.

The buildconfigurations are in the picture since they disable the run buttons
when the user has selected to build before deploy and deploy before run.

Task-number: QTCREATORBUG-16172
Task-number: QTCREATORBUG-15583
Change-Id: I44b5f5ce8e145cb93dc0022f66e1edcc202875e4
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qmakeprojectmanager/qmakenodes.cpp

@@ -1322,8 +1322,6 @@ void QmakePriFileNode::save(const QStringList &lines)
         FileSaver saver(m_projectFilePath.toString(), QIODevice::Text);
         saver.write(lines.join(QLatin1Char('\n')).toLocal8Bit());
         saver.finalize(Core::ICore::mainWindow());
-
-        m_project->projectManager()->notifyChanged(m_projectFilePath);
     }
 
     // This is a hack.