external/harfbuzz: -fsanitize=function

Change-Id: Ie72eec98f1337e895b81c4ebebeefa4861a5a6a1

external/harfbuzz/ubsan.patch

@@ -9,6 +9,17 @@
    }
  };
  
+@@ -394,8 +394,9 @@
+ }
+ 
+ static void
+-_hb_ot_font_destroy (hb_ot_font_t *ot_font)
++_hb_ot_font_destroy (void *ot_font_)
+ {
++  hb_ot_font_t *ot_font = static_cast<hb_ot_font_t *>(ot_font_);
+   ot_font->cmap.fini ();
+   ot_font->h_metrics.fini ();
+   ot_font->v_metrics.fini ();
 --- src/hb-ot-map-private.hh
 +++ src/hb-ot-map-private.hh
 @@ -52,8 +52,11 @@