[jdk13u-dev] RFR: 8247872: Upgrade HarfBuzz to the latest 2.7.2

[Olga Mikhaltsova]

I'd like to backport JDK-8247872 to jdk13u in order to upgrade HarfBuzz upto v 2.7.2.

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.`,- 
and additionally -std=c++11 is added in Awt2dLibraries.gmk for compilation due to the ubiquitous usage of the C++11 features.

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 ed7526a66c67e15cb09da733d3dde50ddabc24ba

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/305/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=305&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247872
  Stats: 44666 lines in 206 files changed: 25199 ins; 12728 del; 6739 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/305.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/305/head:pull/305

PR: https://git.openjdk.java.net/jdk13u-dev/pull/305