Synchronize with FreeType.

Synchronize with FreeType.

This corresponds to the following commits.

  dac5644ceaf07cf8c13b639bae176af7bb42643c, `[base] Optimize
  `FT_Angle_Diff'.'

  a2fa657a03f17ef9cd79b4ad529f08cfe676aa1c, `[autofit] Call dumper functions
  for tracing.'

  886f4d049391993197b409a9038138a8208dd5fe, `[autofit] Finish the thought.)'

  770b5d0647b6102a60db06840e40f860da5810b8, `src/autofit/aflatin.c
  (af_latin_hint_edges): Reduce logic.'

  67b912d2fa17caa921f513cae180c7aae28b1bc6, `src/autofit/afhints.c
  (af_glyph_hints_reload): Use do-while loop.'

  eae1b3e3711d9c9e653b1b05e24f2220c5a3c186, `[autofit,pshinter] NULL.'