Misc OLE/Shell bugfixes

[Mike Hearn]

Thought I might as well get these out of the tree and into peer-review
land....

I wanted to check ILLoadFromStream on Windows, but my 98 dlls don't have
it (it's ME or 2000+ only), and on my friends XP box, the VC++7 platform
SDK didn't appear to have it. It seems the function used to be
undocumented.

ChangeLog:
* GIT should not dereference ppv when unmarshalling interface
* Restore use of refcounting in the GIT
* IMallocSpy cannot cause an allocation failure when cb == 0
* Deal with the case of loading an empty PIDL from a stream better in
ILLoadFromStream

thanks -mike
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