RFR: 8365626: (fs) Improve handling of broken links in Files.isSameFile() (win) [v3]

[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).

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8365626: Address reviewer comments since previous commit

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27079/files
  - new: https://git.openjdk.org/jdk/pull/27079/files/84a880b0..bd4b94df

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27079&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27079&range=01-02

  Stats: 18 lines in 2 files changed: 4 ins; 8 del; 6 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