Have qmakestep trigger the import label

* Do not use the BuildManager but have the qmakestep trigger
   the update via the target and project.

Reviewed-by: dt

src/plugins/qt4projectmanager/qmakestep.cpp

@@ -225,6 +225,7 @@ bool QMakeStep::processFinished(int exitCode, QProcess::ExitStatus status)
     bool result = AbstractProcessStep::processFinished(exitCode, status);
     if (!result)
         m_forced = true;
+    qt4BuildConfiguration()->emitBuildDirectoryInitialized();
     return result;
 }