SETUPAPI: implement SetupDiGetINFClass

[Hans Leidekker]

Code by Hervé Poussineau from ReactOS, with slight modifications
for Wine and A->W conversion by me.

Fixes http://bugs.winehq.org/show_bug.cgi?id=2223

 -Hans

Changelog
  Hervé Poussineau <hpoussin at reactos.com>
  Implement SetupDiGetINFClass.
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