net: remove non-cgo macOS resolver code

The built-in Go resolver works significantly better.
In particular, the use of res_search does not support
CNAME or PTR queries and may not even be thread-safe.

This CL is essentially a revert of CL 166297 plus fixes,
including CL 180842.

See CL 180842 for additional notes about problems
with this approach.

Fixes #31705.

Change-Id: I0a30a0de2fbd04f6c461520fd34378c84aadf66c
Reviewed-on: https://go-review.googlesource.com/c/go/+/180843
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
9 files changed
tree: 7a0bce0415284a5d55670df7012e33edbb5f5b34
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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