Synchronize with FreeType.

Synchronize with FreeType.

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This commit corresponds to the following FreeType changes.

  f7e6d51a * src/autofit/afblue.hin (GET_UTF8_CHAR): Use `do...while(0)'.
  453722db * src/tools/afblue.pl (convert_ascii_chars): Don't ignore spaces.
  a8a54c30 * src/autofit/afblue.dat: Separate blue zone characters with spaces.
  f45c0bf9 [autofit] Use string of standard characters.
  de599941 [autofit] Prepare forthcoming changes.
  24aa9c66 [autofit] Rewrite HarfBuzz interface to support character clusters.
  facb79ab [autofit] Add support for Khmer script.
  c13526e6 * src/autofit/afblue.dat: Add more Khmer clusters.
  f02e1df7 [autofit] Fix tracing message.
  0164d934 [autofit] Introduce subscript top blue zones.
  dd305f31 [autofit] Thinko.
  5330e3de [autofit] Minor.
  bbe84ed9 [autofit] Remove redundant code.
  93fdf4eb Formatting.
  3c3d7c21 Another typo.
  4fe3b55d [autofit] Restore OpenType feature check.
  79a42ad2 * src/autofit/afscript.h: Avoid potential crash.
  868d5a0e * src/autofit/aflatin.c (af_latin_metrics_init_blues): Minor.