directfb: Fix namespace compilation.

Change-Id: I55450e0585092f0b052cf6755acc541915c411e5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/platforms/directfb/qdirectfbinput.h

@@ -51,6 +51,8 @@
 
 #include "qdirectfbconvenience.h"
 
+QT_BEGIN_NAMESPACE
+
 class QDirectFbInput : public QThread
 {
     Q_OBJECT
@@ -81,4 +83,6 @@ private:
     QHash<DFBWindowID,QWindow *>m_tlwMap;
 };
 
+QT_END_NAMESPACE
+
 #endif // QDIRECTFBINPUT_H