oleaut32: Try to re-use existing memory when unmarshalling variants with byref types.

[Robert Shearman]

---
  dlls/oleaut32/tests/usrmarshal.c |    4 +++
  dlls/oleaut32/usrmarshal.c       |   50 
+++++++++++++++++++++----------------
  2 files changed, 32 insertions(+), 22 deletions(-)
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