Add a va_stdafx.h #defining QT_NAMESPACE to empty
Add a va_stdafx.h #defining QT_NAMESPACE to empty

* VAX can get confused by the QT_NAMESPACE macro, and if it thinks Qt
  objects are inside a QT_NAMESPACE namespace then various things will
  break but most commonly the ui objects inside that namespace won't be
  picked up properly.
* See https://forums.wholetomato.com/forum/topic.asp?TOPIC_ID=12573

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