RFR: 8365626: (fs) Improve handling of broken links in Files.isSameFile() (win)

[Brian Burkhalter]

Improve handling of broken symbolic links in `Files.isSameFile` on Windows as was done on Unix by the fix of [JDK-8154364](https://bugs.openjdk.org/browse/JDK-8154364).

-------------

Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/27079/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27079&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365626
  Stats: 177 lines in 4 files changed: 129 ins; 34 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/27079.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27079/head:pull/27079

PR: https://git.openjdk.org/jdk/pull/27079