[1/2] mciqtz32: Guarantees that CoInitialize and CoUninitialize run on the same thread. (try 2)

[Akihiro Sagawa]

Try 2: Rebased latest git. Rename some variable names.

Fixes bug #38241.
mciOpen and mciClose (both for the same MCI device instance) can call in different
threads. Without this patch, mciqtz32 can call CoUninitialize (in mciClose) from
another thread which doesn't call CoInitialize (in mciOpen) before.

---
 dlls/mciqtz32/mciqtz.c         | 147 ++++++++++++++++++++++++++++++++++++-----
 dlls/mciqtz32/mciqtz_private.h |  13 ++++
 2 files changed, 145 insertions(+), 15 deletions(-)

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