harfbuzz library improvements:
* Fixed shaping of Apple Color Emoji flags in right-to-left context.
* Fixed positioning of CFF fonts in HB_TINY profile.
* OpenType 1.9 language tags update.
* Add HB_NO_VERTICAL config option.
* Add HB_CONFIG_OVERRIDE_H for easier configuration.
harfbuzz-subset library improvements:
* Improved packing of cmap, loca, and Ligature tables.
* Significantly improved overflow-resolution strategy in the repacker.
PR: 260363
Exp-run by: antoine
79a4cf5dcc