dsound: do not wait on mixer thread exit on dsound release

[Aric Stewart]

This fixes a loader deadlock if the dsound object is being released
during a dll unload.
---
 dlls/dsound/dsound.c         | 4 +++-
 dlls/dsound/dsound_private.h | 1 +
 dlls/dsound/mixer.c          | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)


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