[jdk21u-dev] RFR: 8307160: Fix AWT/2D/A11Y to support the permissive- flag on the Microsoft Visual C compiler

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle

Resolved flags-cflags.m4

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Commit messages:
 - backport 8bc1867da78ea0b7664892ee277af413ef503b61

Changes: https://git.openjdk.org/jdk21u-dev/pull/2393/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2393&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307160
  Stats: 428 lines in 12 files changed: 284 ins; 50 del; 94 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2393.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2393/head:pull/2393

PR: https://git.openjdk.org/jdk21u-dev/pull/2393