Fix out of the source tree build (again)

[Dmitry Timoshkov]

Hello.

Changelog:
    Dmitry Timoshkov <dmitry at codeweavers.com>
    Fix out of the source tree build (again).

--- cvs/wine/dlls/ddraw/dsurface/wndproc.c	Thu Jul 19 06:38:34 2001
+++ wine/dlls/ddraw/dsurface/wndproc.c	Thu Jul 19 07:52:56 2001
@@ -12,7 +12,7 @@
 #include "winerror.h"
 
 #include "ddraw_private.h"
-#include "wndproc.h"
+#include "dsurface/wndproc.h"
 
 #include "debugtools.h"