[HarfBuzz] harfbuzz: Changes to 'refs/tags/1.7.4'

[Behdad Esfahbod]

Tag '1.7.4' created by Behdad Esfahbod <behdad at behdad.org> at 2017-12-20 17:09 +0000

1.7.4
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Changes since 1.7.3-2:
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