tst_collections: "explicit instantiation of 'NS::QList' must occur in namespace 'NS'

Probably correct.

The question is just why this code has survived for so many years.

Change-Id: Iaf01850476f9b066243abebb9ee6c5928d7ada19
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

tests/auto/corelib/tools/collections/tst_collections.cpp

@@ -90,7 +90,9 @@ void foo()
 #include "qvector.h"
 #include "qqueue.h"
 
+QT_BEGIN_NAMESPACE
 template class QList<int>;
+QT_END_NAMESPACE
 
 class tst_Collections : public QObject
 {