Recovery of release 990110 after disk crash.
See Changelog for changes between 990103 and 990110.

diff --git a/include/dinput.h b/include/dinput.h
index 03978e2..0bf86c3 100644
--- a/include/dinput.h
+++ b/include/dinput.h
@@ -1,6 +1,8 @@
 #ifndef _WINE_DINPUT_H
 #define _WINE_DINPUT_H
 
+#include "unknwn.h"
+
 #define STDMETHOD(xfn) HRESULT (CALLBACK *fn##xfn)
 #define STDMETHOD_(ret,xfn) ret (CALLBACK *fn##xfn)
 #define PURE