Update to 2.1.4, provided by Christopher Richards in PR 21191.

Extract of changes:
    - a fix in the Gzip stream reader, it couldn't read certain .gz files
      properly due to a small typo. In certain cases, FreeType could also
      loop endlessly when trying to load tiny gzipped files.
    - certain fonts couldn't be loaded by 2.1.3 because they lacked a
      Unicode charmap (e.g. SYMBOL.TTF). FreeType erroneously rejected
      them.
    - the CFF loader was modified to accept fonts which only
      contain a subset of their reference charset. This prevented the
      correct use of PDF-embedded fonts.
    - the logic to detect Unicode charmaps has been modified. this is required
      to support fonts which include both 16-bit and 32-bit charmaps (like
      very recent asian ones) using the new 10 and 12 SFNT formats.
    - the TrueType loader now limits the depth of composite glyphs. This is
      necessary to prevent broken fonts to break the engine by blowing the
      stack with recursive glyph definitions.
    - the CMap cache is now capable of managing UCS-4 character codes that
      are mapped through extended charmaps in recent TrueType/OpenType fonts
    - the cache sub-system now properly manages out-of-memory conditions,
      instead of blindly reporting them to the caller. This means that it
      will try to empty the cache before restarting its allocations to see
      if that can help.
    - the PFR driver didn't return the list of available embedded bitmaps
      properly.

    - David Chester contributed some enhancements to the auto-hinter that
      significantly increase the quality of its output. The Postscript hinter
      was also improved in several ways..
    - the FT_RENDER_MODE_LIGHT render mode was implemented
    - a new API, called FT_Get_BDF_Property has been added to FT_BDF_H to
      retrieve BDF properties from BDF _and_ PCF font files. THIS IS STILL
      EXPERIMENTAL, since it hasn't been properly tested yet.
    - a Windows FNT specific API has been added, mostly to access font
      headers. This is used by Wine
    - TrueType tables without a "hmtx" table are now tolerated when an
      incremental interface is used. This happens for certain Type42 fonts
      passed from Ghostscript to FreeType.
    - the PFR font driver is now capable of returning the font family and
      style names when they're available (instead of the sole "FontID"). This
      is performed by parsing an *undocumented* portion of the font file !!

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