RFR: 8247872: Upgrade HarfBuzz to the latest 2.7.2 [v3]

[Phil Race]

> This upgrades JDK to import the current 2.7.2 version of harfbuzz - an OpenType text shaping library
> 
> https://bugs.openjdk.java.net/browse/JDK-8247872
> 
> This has passed building and headless and headful automated tests on all platforms.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8247872: Upgrade HarfBuzz to the latest 2.7.2

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/993/files
  - new: https://git.openjdk.java.net/jdk/pull/993/files/1f47957b..3d172716

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=993&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=993&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/993.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/993/head:pull/993

PR: https://git.openjdk.java.net/jdk/pull/993