Log Message:
harfbuzz: update to 8.4.0.

Overview of changes leading to 8.4.0
Saturday, March 29, 2024
====================================
- Add /bigobj to MSVC compiler flags in meson build, to fix building hb-subset.cc
- Specify minimum versions of various dependencies in meson and autotools build.
- When subsetting, place variation store at the end of “GDEF” table  to fix
  shaping issues with some versions of Adobe InDesign.
- Various build fixes.

- New API:
+hb_buffer_set_random_state()
+hb_buffer_get_random_state()

Overview of changes leading to 8.3.1
Saturday, March 16, 2024
====================================
- hb_blob_create_from_file_or_fail() on Windows will now try to interpret the
  file name as UTF-8 first, and as system code page if it is not valid UTF-8.
- Fix hb_style_get_value() in fonts with “STAT” table.
- Properly handle negative offsets in CFF table.
- Update IANA Language Subtag Registry to 2024-03-07.
- Subsetter now supports subsetting “BASE” table.
- Subsetter will update “hhea” font metrics in sync with “OS/2” ones.
- “--variations” option of “hb-subset” now supports leaving out values that
  should be unchanged, e.g. “wght=:500:” will change the default and keep max
  and min unchanged. It also supports “*=drop” to to pin all axes to default
  location.
- Fix hb_ot_math_get_glyph_kerning() to match updated “MATH” table spec.
- Support legacy MacRoman encoding in “cmap” table.
- Various build fixes.
- Various subsetting and instancing fixes.

- New API:
hb_subset_input_pin_all_axes_to_default()