[singlejar] Fix Windows long path issue

Fix #6990

Drive-by:
- Add newline for `diag_*` macros. Singlejar error log should be easier to read now.
- Resolve a TODO for `test_util`.
- #ifdef away `int fd()` for `InputJar` and `MappedFile` on Windows. These functions are not used by public Bazel code (may be used in Google's own code though); removing them simplifies the implementation of `MappedFile` on Windows.

Closes #6992.

PiperOrigin-RevId: 227681198
10 files changed
tree: df363ba97aa40c7dac4fcbf89ccb49d424dd268c
  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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