[jdk13u-dev] RFR: 8261169: Upgrade HarfBuzz to the latest 2.8.0

[Olga Mikhaltsova]

I'd like to backport JDK-8261169 to jdk13u in order to upgrade HarfBuzz up to v 2.8.0.

The original patch applies almost cleanly except the only file that is in another directory:
make/lib/Awt2dLibraries.gmk instead of make/modules/java.desktop/lib/Awt2dLibraries.gmk.

`JDK-8266545: 8261169 broke Harfbuzz build with gcc 7 and 8`
will be backported right after it.

All regular tests passed (tested on Windows x86/x86_64 (VS 2017), Linux x86/x86_64 (gcc 8.3.0), Mac OS X x86_64 (XCode/Clang 11.0), Linux aarch64 (gcc 9.3.0)).

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Commit messages:
 - Backport 80323b7f66541e24177d02cc668a2eb9267962b9

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/306/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=306&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261169
  Stats: 13120 lines in 123 files changed: 7021 ins; 2757 del; 3342 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/306.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/306/head:pull/306

PR: https://git.openjdk.java.net/jdk13u-dev/pull/306