[jdk11u-dev] RFR: JDK-8282588: [11] set harfbuzz compilation flag to -std=c++11

[Matthias Baesken]

As a preparation to update harfbuzz in jdk11u-dev to the versions used in higher JDK (harfbuzz 2.7.2 / 2.8.0) increment the C++ version
for harfbuzz to C++11.
Some time later, the harfbuzz changes are backported.
This gives everybody time to make sure the compilers work with the C++11 flag, or system harfbuzz is used as a workaround.

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Commit messages:
 - JDK-8282588

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/853/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=853&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282588
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/853.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/853/head:pull/853

PR: https://git.openjdk.java.net/jdk11u-dev/pull/853