Re: [PATCH v4 0/4] MR7928: coremessaging: Partially implement CreateDispatcherQueueController().

[Mohamad Al-Jaf (＠maljaf)]

**v3**
- Use `async.c` from `windows.media.speech`
- Add `Sleep( 100 )` to improve test reliability for dedicated thread queues
- Remove redundant `check_interface( operation, &IID_IAsyncInfo );`
- Add missing header guard in `private.h`