Fix compile on linux + qt < 5

Change-Id: Iadb7df3cdb32180f78dace7bc11c7c673399c65b
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>

src/plugins/qmldesigner/designercore/instances/nodeinstanceserverproxy.cpp

@@ -159,7 +159,7 @@ NodeInstanceServerProxy::NodeInstanceServerProxy(NodeInstanceView *nodeInstanceV
    QProcessEnvironment environment = QProcessEnvironment::systemEnvironment();
 
 #if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0)) && (defined(Q_OS_MAC) || defined(Q_OS_LINUX))
-   enviroment.insert(QLatin1String("DESIGNER_DONT_USE_SHARED_MEMORY"), QLatin1String("1"));
+   environment.insert(QLatin1String("DESIGNER_DONT_USE_SHARED_MEMORY"), QLatin1String("1"));
 #endif
 
    if (QFileInfo(applicationPath).exists()) {