[release-branch.go1.21] cmd/go: find GOROOT using os.Executable when installed to GOROOT/bin/GOOS_GOARCH

When running make.bash in a cross-compiled configuration
(for example, GOARCH different from GOHOSTARCH), cmd/go
is installed to GOROOT/bin/GOOS_GOARCH instead of GOROOT/bin.

That means that we need to look for GOROOT in both ../.. and ../../..,
not just the former.

Fixes #62144.
Updates #62119.
Updates #18678.

Change-Id: I283c6a10c46df573ff44da826f870417359226a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/521015
Reviewed-by: Michael Matloob <matloob@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit 9e9556d328c53ed0a4d8b36feee949885d648ba8)
Reviewed-on: https://go-review.googlesource.com/c/go/+/521695
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
3 files changed
tree: 69c0fdbf8d701a43d7a470c434ff18487bb6472f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
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