[ot] Move GDEF into tables_t

src/hb-ot-layout-gsubgpos-private.hh

diff --git a/src/hb-ot-layout-gsubgpos-private.hh b/src/hb-ot-layout-gsubgpos-private.hh
index 747811e..f3566ab 100644
--- a/src/hb-ot-layout-gsubgpos-private.hh
+++ b/src/hb-ot-layout-gsubgpos-private.hh
@@ -480,7 +480,7 @@
 			iter_input (), iter_context (),
 			font (font_), face (font->face), buffer (buffer_),
 			recurse_func (nullptr),
-			gdef (*hb_ot_layout_from_face (face)->gdef),
+			gdef (*hb_ot_layout_from_face (face)->table.GDEF),
 			var_store (gdef.get_var_store ()),
 			direction (buffer_->props.direction),
 			lookup_mask (1),