QmlDesigner: Fix compilation of core tests for non -nokia-developer builds

Use explicit DEFINE to enable additional API in node instances for testing,
not QT_BUILD_INTERNAL.

src/plugins/qmldesigner/core/include/nodeinstance.h

@@ -135,7 +135,7 @@ public:
 
     static void registerDeclarativeTypes();
 
-#ifdef QT_BUILD_INTERNAL
+#ifdef QTCREATOR_TEST
     QObject* testHandle() const;
 #endif
 private: // functions

src/plugins/qmldesigner/core/instances/nodeinstance.cpp

@@ -622,7 +622,7 @@ void NodeInstance::registerDeclarativeTypes()
     qmlRegisterType<QmlDesigner::Internal::QmlPropertyChangesObject>();
 }
 
-#ifdef QT_BUILD_INTERNAL
+#ifdef QTCREATOR_TEST
 QObject* NodeInstance::testHandle() const
 {
     return internalObject();

tests/auto/qml/qmldesigner/coretests/coretests.pro

@@ -8,7 +8,7 @@ include(../../../../../src/libs/qmljs/qmljs-lib.pri)
 HEADERS+=../../../../../src/libs/utils/changeset.h
 SOURCES+=../../../../../src/libs/utils/changeset.cpp
 INCLUDEPATH+=../../../../../src/libs
-DEFINES+=QTCREATOR_UTILS_STATIC_LIB QML_BUILD_STATIC_LIB
+DEFINES+=QTCREATOR_UTILS_STATIC_LIB QML_BUILD_STATIC_LIB QTCREATOR_TEST
 
 DEPENDPATH += ..
 DEPENDPATH += ../../../../../src/plugins/qmldesigner/core/include