RFR: 8306882: (fs) Path.toRealPath(LinkOption.NOFOLLOW_LINKS) fails when "../../" follows a link [v3]

[Brian Burkhalter]

> Modify `Path.toRealPath` such that it does not collapse links such as "link/.." or "link/../.." when `LinkOption.NOFOLLOW_LINKS` is specified or, in some cases, not.

Brian Burkhalter has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - 8306882: Add tests; put Windows on problem list
 - Merge
 - 8306882: Revert Windows and test changes; add some text to comments in Unix change
 - 8306882: (fs) Path.toRealPath(LinkOption.NOFOLLOW_LINKS) fails when "../../" follows a link

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Changes: https://git.openjdk.org/jdk/pull/15397/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15397&range=02
  Stats: 70 lines in 3 files changed: 63 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15397/head:pull/15397

PR: https://git.openjdk.org/jdk/pull/15397