QmlDesigner: Add missing include

Change-Id: Ib521eab639f416fcacece6d396bc90c2fa473235
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/designercore/include/nodeinstanceview.h

@@ -41,6 +41,8 @@
 #include <QTime>
 #include <QtGui/qevent.h>
 
+#include <memory.h>
+
 namespace ProjectExplorer {
 class Target;
 }