[FT] Adapt to new face API

src/hb-ft.cc

diff --git a/src/hb-ft.cc b/src/hb-ft.cc
index 953f0a6..7152805 100644
--- a/src/hb-ft.cc
+++ b/src/hb-ft.cc
@@ -293,6 +293,9 @@
     face = hb_face_create_for_tables (reference_table, ft_face, destroy);
   }
 
+  hb_face_set_index (face, ft_face->face_index);
+  hb_face_set_upem (face, ft_face->units_per_EM);
+
   return face;
 }