RFR: 8307160: Fix AWT/2D/A11Y to support the permissive- flag on the Microsoft Visual C compiler [v8]

[Julian Waters]

> We should set the -permissive- flag for the Microsoft Visual C compiler, as was requested by the now backed out [JDK-8241499](https://bugs.openjdk.org/browse/JDK-8241499). Doing so makes the Visual C compiler much less accepting of ill formed code, which will improve code quality on Windows in the future.

Julian Waters has updated the pull request incrementally with one additional commit since the last revision:

  Don't use permissive- in flags-cflags.m4 for now

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15096/files
  - new: https://git.openjdk.org/jdk/pull/15096/files/15ae2781..0566de0c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15096&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15096&range=06-07

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15096.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15096/head:pull/15096

PR: https://git.openjdk.org/jdk/pull/15096