include: Undefine INTERFACE before defining it.

include/d3d.h

@@ -202,6 +202,7 @@ typedef DWORD D3DVIEWPORTHANDLE, *LPD3DVIEWPORTHANDLE;
 /*****************************************************************************
  * IDirect3D interface
  */
+#undef INTERFACE
 #define INTERFACE IDirect3D
 DECLARE_INTERFACE_(IDirect3D,IUnknown)
 {

include/d3d8.h

@@ -129,6 +129,7 @@ typedef struct IDirect3DVolumeTexture8 *LPDIRECT3DVOLUMETEXTURE8, *PDIRECT3DVOLU
 /*****************************************************************************
  * IDirect3D8 interface
  */
+#undef INTERFACE
 #define INTERFACE IDirect3D8
 DECLARE_INTERFACE_(IDirect3D8,IUnknown)
 {

include/d3d9.h

@@ -163,6 +163,7 @@ typedef struct IDirect3DQuery9 *LPDIRECT3DQUERY9, *PDIRECT3DQUERY9;
 /*****************************************************************************
  * IDirect3D9 interface
  */
+#undef INTERFACE
 #define INTERFACE IDirect3D9
 DECLARE_INTERFACE_(IDirect3D9,IUnknown)
 {

include/ddraw.h

@@ -1220,6 +1220,7 @@ typedef struct tagDDDEVICEIDENTIFIER2 {
 /*****************************************************************************
  * IDirectDrawPalette interface
  */
+#undef INTERFACE
 #define INTERFACE IDirectDrawPalette
 DECLARE_INTERFACE_(IDirectDrawPalette,IUnknown)
 {