Updated harfbuzz to 1.4.1.

Overview of changes leading to 1.4.1
Thursday, January 5, 2017
====================================

- Always build and use UCDN for Unicode data by default.
  Reduces dependence on version of Unicode data in glib,
  specially in the Windows bundles we are shipping, which
  have very old glib.


Overview of changes leading to 1.4.0
Thursday, January 5, 2017
====================================

- Merged "OpenType GX" branch which adds core of support for
  OpenType 1.8 Font Variations.  To that extent, the relevant
  new API is:

New API:
hb_font_set_var_coords_normalized()

  with supporting API:

New API:
HB_OT_LAYOUT_NO_VARIATIONS_INDEX
hb_ot_layout_table_find_feature_variations()
hb_ot_layout_feature_with_variations_get_lookups()
hb_shape_plan_create2()
hb_shape_plan_create_cached2()

  Currently variations in GSUB/GPOS/GDEF are fully supported,
  and no other tables are supported.  In particular, fvar/avar
  are NOT supported, hence the hb_font_set_var_coords_normalized()
  taking normalized coordinates.  API to take design coordinates
  will be added in the future.

  HVAR/VVAR/MVAR support will also be added to hb-ot-font in the
  future.

- Fix regression in GDEF glyph class processing.
- Add decompositions for Chakma, Limbu, and Balinese in USE shaper.
- Misc fixes.

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