WindowsFileSystem: use JNI impl. of isJunction

Also build the JNI library while bootstraping.
This was once submitted in commit 4a249b6962d32ed4cfd4165dfdae4a555b00bb69 but got
rolled back due to some test breakage that's long
since fixed. In this change I'm slightly modifying
the original code in compile.sh.

Using JNI methods however is necessary because we
can't implement WindowsFileOperations.GetLongPath
in native Java, and having that code is a
prerequisite for the fix of https://github.com/bazelbuild/bazel/issues/2145

See also https://github.com/bazelbuild/bazel/issues/2238

--
PiperOrigin-RevId: 142535019
MOS_MIGRATED_REVID=142535019
2 files changed
tree: 9f3bafa0a7aecffc8299581655ecc11d9172ba29
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.sh
  13. compile.sh
  14. CONTRIBUTING.md
  15. CONTRIBUTORS
  16. ISSUE_TEMPLATE.md
  17. LICENSE.txt
  18. README.md
  19. WORKSPACE
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