[jdk21u-dev] RFR: 8323008: filter out harmful -std* flags added by autoconf from CXX

[Goetz Lindenmaier]

GHA actions are failing because of this issue.

Resolved Copyright, will mark clean if not recognized as such anyways.

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Commit messages:
 - Backport 68c4286026bc2c0ec0f594e0b96fe03fe5624d6d

Changes: https://git.openjdk.org/jdk21u-dev/pull/191/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=191&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323008
  Stats: 8 lines in 2 files changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/191.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/191/head:pull/191

PR: https://git.openjdk.org/jdk21u-dev/pull/191