mciwave: Allow (again) to set wave format parameters prior to recording.

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

Hi,

This fixes bug 15060 and matches MCI's behaviour.
It depends on today's Set PCM only patch.

The new invariant that summarises MCI's observed behaviour is explained here:
+ * wmw->lpWaveFormat points to the default wave format at wmw->wfxRef
+ * until either Open File or Record.  It becomes immutable afterwards,
+ * i.e. Set wave format or channels etc. is subsequently refused.

Regards,
	Jörg Höhle.
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