winmm: Prepare transition of MCI parser to 64bit.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

This patch helps simplify my 64bit parser patch (that Eric found ugly).

%s is presumably unusable with data[N] in 64bit because of mixed
DWORD/DWORD_PTR-sized elements, hence broken alignment.

Thus I've moved the printing of strings into the parser loop.
The memory dump part remains.

Aborting one attempt, I decided not to write a patch that would
enable MCI_RETURN to be located at an arbitrary position.  The
reason is that I know of no resource that would use that feature,
so it would not be possible to test it.
Instead, I've added a safety-check that rejects MCI_RETURN not
in pole position.

Regards,
 Jörg Höhle





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