quartz: Unregister window class after shutdown.
diff --git a/dlls/quartz/quartz_private.h b/dlls/quartz/quartz_private.h
index 3094b1b..4bc9de5 100644
--- a/dlls/quartz/quartz_private.h
+++ b/dlls/quartz/quartz_private.h
@@ -67,6 +67,7 @@
HRESULT IEnumFiltersImpl_Construct(IBaseFilter ** ppFilters, ULONG nFilters, IEnumFilters ** ppEnum);
extern const char * qzdebugstr_guid(const GUID * id);
+extern void video_unregister_windowclass(void) DECLSPEC_HIDDEN;
BOOL CompareMediaTypes(const AM_MEDIA_TYPE * pmt1, const AM_MEDIA_TYPE * pmt2, BOOL bWildcards);
void dump_AM_MEDIA_TYPE(const AM_MEDIA_TYPE * pmt);