Pass `AF_FaceGlobals` to many functions, or provide it, tagged with
`FT_UNUSED`. We need this later on to access a dynamically linked HarfBuzz
library.
* src/autofit/ft-hb-ft.h (ft_hb_ft_font_create): Use `globals` argument.
Drop unused `destroy` argument.
* src/autofit/ft-hb-ft.c (ft_hb_ft_face_create, ft_hb_ft_font_create): Use
`globals` argument.
Drop unused `destroy` argument.
(ft_hb_ft_face_create, ft_hb_ft_reference_table): Cast `user_data` to
`AF_FaceGlobals`.
* src/autofit/afadjust.c (af_get_glyph_alternates_helper,
af_get_glyph_alternates): Add `globals` argument.
Update callers.
* src/autofit/afshaper.c, src/autofit/afshaper.h (af_shaper_buf_create,
af_shaper_buf_destroy): Use `globals` argument.
* src/autofit/afglobal.c (af_face_globals_new): Updated.
* src/autofit/afcjk.c (af_cjk_metrics_init_widths,
af_cjk_metrics_init_blues, af_cjk_metrics_check_digits): Updated.
* src/autofit/aflatin.c (af_latin_metrics_init_widths,
af_latin_metrics_init_blues, af_latin_metrics_check_digits): Updated.
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