winmm: Require at least 16 bytes in the WAVE fmt header for PlaySound

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

Hi,

I don't know if old .wav files exist with a tiny WAVEFORMAT
(< PCMWAVEFORMAT) structure.
If yes, what would be appropriate heuristics to fill in the missing BitsPerSample?
In the meantime, disallow (like my former patch did for another component).

Regards,
	Jörg Höhle.
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