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.