[oleaut32] Bugfix patches for marshaling VT_UNKNOWN in SAFEARRAYS

[Rosen Diankov]

Many applications marshal SAFEARRAY structures with IUnknown interfaces in
them. The following short patches in dlls/oleaut32/usrmarshal.c should
implement support for them.

One thing I'm not sure yet is if the marshaling requires 4-byte alignment.
Seems to work as is though.

related to this bug report:

http://bugs.winehq.org/show_bug.cgi?id=33887
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