setupapi: Implement SetupGetSourceFileLocation{A,W}. 1/5

[Hans Leidekker]

Is there anything wrong with this patch set?

Fixes:
  http://bugs.winehq.org/show_bug.cgi?id=6490

And gets the MS Jet 4.0 installer further along:
  http://bugs.winehq.org/show_bug.cgi?id=6085

 -Hans

Changelog
  Implement SetupGetSourceFileLocation{A,W}.
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