winmm/mmio: Add extra handling for unbuffered MMIO handles

[Jari Vetoniemi]

On non buffered mmioSeek, set the lBufOffset accordingly.
On non buffered mmioRead, seek to beginning of the file and return 0
meaning that the file ended.

I don't know if this just reveals bad programming in application,
or that native winmm likes to try handle code when it's wrongly used..

Fixes crashing on unbuffered cases.
Bug #28982
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