Added the actual interface definitions to the obj_marshal.h skeleton
file. Also defined the associated C API.

diff --git a/include/objbase.h b/include/objbase.h
index ea6ab6f..3335a31 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -8,10 +8,10 @@
 #include "wine/obj_misc.h"
 #include "wine/obj_channel.h"
 #include "wine/obj_clientserver.h"
-#include "wine/obj_marshal.h"
 #include "wine/obj_storage.h"
 
 /* the following depend on obj_storage.h */
+#include "wine/obj_marshal.h"
 #include "wine/obj_moniker.h"
 #include "wine/obj_propertystorage.h"