Don't do fallback positioning for Indic and Thai shapers
diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 1c7de0d..130a632 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -1360,4 +1360,5 @@
   compose_indic,
   setup_masks_indic,
   false, /* zero_width_attached_marks */
+  false, /* fallback_position */
 };