Patch #734231: Update RiscOS support. In particular, correct
riscospath.extsep, and use os.extsep throughout.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index cf7dd3b..b2b72c8 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -5086,7 +5086,7 @@
 			   sanity checks and constructing a new argument
 			   list.  Cut all that nonsense short -- this speeds
 			   up instance creation tremendously. */
-			specific = type->tp_new;
+			specific = (void *)type->tp_new;
 			/* XXX I'm not 100% sure that there isn't a hole
 			   in this reasoning that requires additional
 			   sanity checks.  I'll buy the first person to