oleaut32: Fix circular reference counting in typelibs/typeinfos.

[Rob Shearman]

Do not rely on the reference count of ITypeInfo's to go to zero to
delete them. Instead only rely on the parent typelib's reference
count, but update the parent typelib's reference count based on
whether each typeinfo has a valid reference.
---
 dlls/oleaut32/typelib.c |  173 ++++++++++++++++++++++++-----------------------
 1 files changed, 88 insertions(+), 85 deletions(-)
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