syscall, cmd/go/internal/lockedfile/internal/filelock: add and use Flock on illumos

Copy the syscall wrapper from golang.org/x/sys/unix CL 255377 to provide
Flock on illumos and switch cmd/go/internal/lockedfile/internal/filelock
to use it.

Fixes #35618

Change-Id: I876a2b782329a988fa85361fb1ea58eb6f329af1
Reviewed-on: https://go-review.googlesource.com/c/go/+/255258
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
5 files changed
tree: 493d5c0591413e9423d529c1c0e74e165a83e3ae
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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