Log Message:
harfbuzz*: update to 4.3.0

Add PLIST_SUBST to reduce PLIST churn.

Overview of changes leading to 4.3.0
Friday, May 20, 2022
====================================
- Major speed up in loading and subsetting fonts, especially in
  handling CFF table. Subsetting some fonts is now 3 times faster.
  (Behdad Esfahbod, Garret Rieger)
- Speed up blending CFF2 table. (Behdad Esfahbod)
- Speed up hb_ot_tags_from_language(). (Behdad Esfahbod, David Corbett)
- Fix USE classification of U+10A38 to fix multiple marks on single Kharoshthi
  base. (David Corbett)
- Fix parsing of empty CFF Index. (Behdad Esfahbod)
- Fix subsetting CPAL table with partial palette overlaps. (Garret Rieger)

- New API
+hb_map_is_equal() (Behdad Esfahbod)