oleaut32/tests: Call VarBstrFromCy via manually obtained pointer

[Michael Karcher]

Obviously, ancient (win32s?) versions of oleaut32 did not
contain this function. This fixes invocation.
---
 dlls/oleaut32/tests/vartype.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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