Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-ft.h

Index: third_party/harfbuzz-ng/src/hb-ft.h
diff --git a/third_party/harfbuzz-ng/src/hb-ft.h b/third_party/harfbuzz-ng/src/hb-ft.h
index be5c854723a95073543c814a079533b4d622ca5d..c1772ac15b7514ccde5461685a508c4f5c39037b 100644
--- a/third_party/harfbuzz-ng/src/hb-ft.h
+++ b/third_party/harfbuzz-ng/src/hb-ft.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009  Red Hat, Inc.
+ * Copyright © 2009  Red Hat, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -36,15 +36,12 @@
 
 HB_BEGIN_DECLS
 
-
-hb_font_funcs_t *
-hb_ft_get_font_funcs (void);
+/* Note: FreeType is not thread-safe.  Hence, these functions are not either. */
 
 hb_face_t *
 hb_ft_face_create (FT_Face           ft_face,
 		   hb_destroy_func_t destroy);
 
-/* Note: This function is not thread-safe */
 hb_face_t *
 hb_ft_face_create_cached (FT_Face ft_face);
 
@@ -53,6 +50,15 @@ hb_ft_font_create (FT_Face           ft_face,
 		   hb_destroy_func_t destroy);
 
 
+
+/* Makes an hb_font_t use FreeType internally to implement font functions. */
+void
+hb_ft_font_set_funcs (hb_font_t *font);
+
+FT_Face
+hb_ft_font_get_face (hb_font_t *font);
+
+
 HB_END_DECLS
 
 #endif /* HB_FT_H */