boost references are unhealty for VclPtr.

Change-Id: I7ce41ecff1eee4cb45f685a0f4dddb31225ac542
diff --git a/cppcanvas/qa/unit/test.cxx b/cppcanvas/qa/unit/test.cxx
index 02a3616..684980a 100644
--- a/cppcanvas/qa/unit/test.cxx
+++ b/cppcanvas/qa/unit/test.cxx
@@ -43,7 +43,7 @@ public:
void CanvasTest::testComposite()
{
#ifdef LINUX
    boost::scoped_ptr<vcl::Window> pWin(new WorkWindow( (vcl::Window *)NULL ));
    VclPtr<vcl::Window> pWin(new WorkWindow( (vcl::Window *)NULL ));

    uno::Reference<rendering::XCanvas> xCanvas = pWin->GetCanvas ();
    if( !xCanvas.is() )