Log Message:
harfbuzz*: update to 4.0.0

Overview of changes leading to 4.0.0
Tuesday, March 1, 2022
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- New public API to create subset plan and gather information on things like
  glyph mappings in the final subset. The plan can then be passed on to perform
  the subsetting operation. (Garret Rieger)
- Draw API for extracting glyph shapes have been extended and finalized and is
  no longer an experimental API. The draw API supports glyf, CFF and CFF2
  glyph outlines tables, and applies variation settings set on the font as well
  as synthetic slant. The new public API is not backward compatible with the
  previous, non-public, experimental API. (Behdad Esfahbod)
- The hb-view tool will use HarfBuzz draw API to render the glyphs instead of
  cairo-ft when compiled with Cairo 1.17.5 or newer, setting HB_DRAW
  environment variable to 1 or 0 will force using or not use the draw API,
  respectively. (Behdad Esfahbod)
- The hb-shape and hb-view tools now default to using HarfBuzz’s own font
  loading functions (ot) instead of FreeType ones (ft). They also have a new
  option, --font-slant, to apply synthetic slant to the font. (Behdad Esfahbod)
- HarfBuzz now supports more than 65535 (the OpenType limit) glyph shapes and
  metrics. See https://github.com/be-fonts/boring-expansion-spec/issues/6 and
  https://github.com/be-fonts/boring-expansion-spec/issues/7 for details.
  (Behdad Esfahbod)
- New API to get the dominant horizontal baseline tag for a given script.
  (Behdad Esfahbod)
- New API to get the baseline positions from the font, and synthesize missing
  ones. As well as new API to get font metrics and synthesize missing ones.
  (Matthias Clasen)
- Improvements to finding dependencies on Windows when building with Visual
  Studio. (Chun-wei Fan)
- New buffer flag, HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT, that must be set
  during shaping for HB_GLYPH_FLAG_UNSAFE_TO_CONCAT flag to be reliably
  produced. This is to limit the performance hit of producing this flag to when
  it is actually needed. (Behdad Esfahbod)
- Documentation improvements. (Matthias Clasen)