Include rpc*.h/windows.h/ole2.h just like windows.

diff --git a/include/comcat.h b/include/comcat.h
index 2d8563d..f9e042d 100644
--- a/include/comcat.h
+++ b/include/comcat.h
@@ -1,13 +1,14 @@
-#ifndef __WINE_COMCAT_H
-#define __WINE_COMCAT_H
-
+#ifndef __WINE__
 #include "rpc.h"
 #include "rpcndr.h"
-
 #ifndef COM_NO_WINDOWS_H
 #include "windows.h"
 #include "ole2.h"
 #endif
+#endif
+
+#ifndef __WINE_COMCAT_H
+#define __WINE_COMCAT_H
 
 #include "unknwn.h"