oledb32: Implement conversions to DBTYPE_BYREF | DBTYPE_WSTR.

[Huw Davies]

---
 dlls/oledb32/convert.c       |   21 ++++++++++
 dlls/oledb32/tests/convert.c |   89 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+), 0 deletions(-)
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