Windows: implement readSymbolicLink

In this PR:

- Implement ReadSymlinkOrJunction in the JNI
  library, and expose it to Java code. This method
  can resolve symlinks and junctions.

- Override readSymbolicLink in WindowsFileSystem
  and use the new native method

- Add unit tests to exercise junction resolution.
  Manual testing shows the code works for symlinks
  too, however we cannot reliably create them in
  tests because that requires unprivileged symlink
  creation support (i.e. for the test to run as
  Admin, or for the OS having enabled it)

Fixes https://github.com/bazelbuild/bazel/issues/7907

Closes #7929.

PiperOrigin-RevId: 241899544
6 files changed
tree: d3e17a3d6fe903c0daa37fff96a92d73446a1cc0
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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