cmd/go: insert goroot to the hash of build cache when the packages include C files

This reverts CL 351851, which itself reverted CL 348991.

The problem with the original CL, as far as I can tell, was due to a
bug in the Go project's builder infrastructure (#33598) and not the
change itself. Once the build infrastructure is fixed, this change
can be resubmitted.

Fixes #48319
Updates #33598

Change-Id: I0fdbcc241eb2bdeb350944aad58bf58774fb591e
Reviewed-on: https://go-review.googlesource.com/c/go/+/353352
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2 files changed
tree: 0c828f900936e219532c86ca2d6d39b48a5cb40c
  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
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