Assistant: Fixed build for QT_NO_CURSOR

Change-Id: I5f1f3774ac81ea61406c6ef964fd189051ebe994
Reviewed-by: David Schulz <david.schulz@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>

src/assistant/help/qhelpengine.cpp

@@ -96,22 +96,30 @@ void QHelpEnginePrivate::applyCurrentFilter()
 
 void QHelpEnginePrivate::setContentsWidgetBusy()
 {
+#ifndef QT_NO_CURSOR
     contentWidget->setCursor(Qt::WaitCursor);
+#endif
 }
 
 void QHelpEnginePrivate::unsetContentsWidgetBusy()
 {
+#ifndef QT_NO_CURSOR
     contentWidget->unsetCursor();
+#endif
 }
 
 void QHelpEnginePrivate::setIndexWidgetBusy()
 {
+#ifndef QT_NO_CURSOR
     indexWidget->setCursor(Qt::WaitCursor);
+#endif
 }
 
 void QHelpEnginePrivate::unsetIndexWidgetBusy()
 {
+#ifndef QT_NO_CURSOR
     indexWidget->unsetCursor();
+#endif
 }
 
 void QHelpEnginePrivate::stopDataCollection()