Target options: Clearer naming for qt mkspec setting.

Change-Id: Ia9b5838d83afad828d7926f9db5c30e3ac021877
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/qt4projectmanager/qmakeprofileconfigwidget.cpp

@@ -62,7 +62,7 @@ QmakeProfileConfigWidget::QmakeProfileConfigWidget(ProjectExplorer::Profile *p,
 
 QString QmakeProfileConfigWidget::displayName() const
 {
-    return tr("Mkspec:");
+    return tr("Qt mkspec:");
 }
 
 void QmakeProfileConfigWidget::makeReadOnly()