Build fix

Change-Id: I97835671805a1ba8ac456f3049cb3e477894a3c0
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/kitmanagerconfigwidget.cpp

@@ -179,7 +179,7 @@ void KitManagerConfigWidget::addConfigWidget(ProjectExplorer::KitConfigWidget *w
 
     QAction *action = new QAction(tr("Mark as Mutable"), 0);
     action->setCheckable(true);
-    action->setData(QVariant::fromValue(widget));
+    action->setData(QVariant::fromValue(qobject_cast<QObject *>(widget)));
     action->setChecked(widget->isMutable());
     action->setEnabled(!widget->isSticky());
     widget->mainWidget()->addAction(action);