oleaut32: Fix BSTR marshaling to be wire compatible with Windows

[Huw Davies]

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 dlls/oleaut32/tests/usrmarshal.c |   68 ++++++++++++++++++++++++++++++++
 dlls/oleaut32/usrmarshal.c       |   81 ++++++++++++++++++++++++--------------
 2 files changed, 120 insertions(+), 29 deletions(-)
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