[release-branch.go1.18] runtime: revert "call __fork instead of fork on darwin"

A recent comment on #57263 reports an unexplained crash in a cgo program
that is fixed by reverting the __fork fix. We don't have any viable fix for the
os/exec bug at this point, so give up on a fix for the January point releases.

This reverts CL 459179 (commit 07b6ffb79c90).

Fixes #57689.

Change-Id: I3b81de6bded399f47862325129e86a65c83d8e3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/461116
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
7 files changed
tree: 5d7f680d70221d3723aca86d1f558b0623d30010
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
  18. VERSION
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