[dsound/tests] Fix failure on Win9x and NT4

[Paul Vriens]

Hi,

Dsound dll loading works differently on win9x and NT4 (can't check on 
WinME but according to test.winehq.org it looks like this is also the
case on that platform).

Changelog
   Fix failure on Win9x and NT4

-- 
Cheers,

Paul.

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