Add remaining changes for bootstrap build on OpenBSD.

I have tested these changes via a bootstrap build on OpenBSD 6.6-current (amd64 architecture). The resulting `bazel` binary appeared to work in some simple testing involving `cc_library`, `cc_binary`, `java_library`, and `java_binary`.

Known issues/limitations:

- Building a `java_binary`'s deploy JAR fails because the `singlejar` tool fails to build. I intend to investigate soon.

- Running Bazel requires a `--host_javabase=@local_jdk//:jdk` flag.

- Sandboxing is unsupported.

This change, split out of the larger PR https://github.com/bazelbuild/bazel/pull/10274, is part of the OpenBSD port in https://github.com/bazelbuild/bazel/issues/10250. Most of the changes in that larger PR have already been committed via several smaller PRs (see the PRs linked from https://github.com/bazelbuild/bazel/issues/10250). This PR collects the remaining changes.

Closes #10567.

PiperOrigin-RevId: 290745757
18 files changed
tree: 327c622780540ff040c6baf6d63bd52b5f67b313
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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