[jdk11u-dev] RFR: 8210920: Native C++ tests are not using CXXFLAGS

[Christoph Langer]

Backport of JDK-8210920: Native C++ tests are not using CXXFLAGS

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Commit messages:
 - Backport 481a045635fd3cafadf2e5314570b1bf6e45ba89

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/385/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=385&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210920
  Stats: 28 lines in 4 files changed: 5 ins; 17 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/385.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/385/head:pull/385

PR: https://git.openjdk.java.net/jdk11u-dev/pull/385