Added some stubs.
Started implementing some interfaces in FilterGraph.

diff --git a/dlls/quartz/sysclock.h b/dlls/quartz/sysclock.h
index 1e3db40..2fe9613 100644
--- a/dlls/quartz/sysclock.h
+++ b/dlls/quartz/sysclock.h
@@ -31,7 +31,8 @@
 
 HRESULT QUARTZ_CreateSystemClock(IUnknown* punkOuter,void** ppobj);
 
-void CSystemClock_InitIReferenceClock( CSystemClock* psc );
+HRESULT CSystemClock_InitIReferenceClock( CSystemClock* psc );
+void CSystemClock_UninitIReferenceClock( CSystemClock* psc );
 
 
 #endif  /* WINE_DSHOW_SYSCLOCK_H */