ole32: Add some more tests for failure cases of Co* functions and make builtin ole32 pass them.

[Robert Shearman]

---
  dlls/ole32/compobj.c       |   27 +++++++++++++++++++++------
  dlls/ole32/tests/compobj.c |   37 +++++++++++++++++++++++++++++++++++++
  dlls/ole32/tests/marshal.c |   17 -----------------
  3 files changed, 58 insertions(+), 23 deletions(-)
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