Replaced references to interfaces.h by wine/obj_xxx.h headers instead
since these headers already provide the necessary definitions.

diff --git a/graphics/d3dexecutebuffer.c b/graphics/d3dexecutebuffer.c
index 32c5fff..7334522 100644
--- a/graphics/d3dexecutebuffer.c
+++ b/graphics/d3dexecutebuffer.c
@@ -8,7 +8,7 @@
 #include "windows.h"
 #include "wintypes.h"
 #include "winerror.h"
-#include "interfaces.h"
+#include "wine/obj_base.h"
 #include "heap.h"
 #include "ddraw.h"
 #include "d3d.h"