[HarfBuzz] harfbuzz: Changes to 'refs/tags/2.2.0'

[Behdad Esfahbod]

Tag '2.2.0' created by Behdad Esfahbod <behdad at behdad.org> at 2018-11-29 16:54 +0000

2.2.0
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Changes since 2.1.3-185:
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