cmd/go: fix go list -test where C is a dependency.

Currently go list -test runtime/cgo fails with an index out of range
error. This appears to be because the updating of import paths that
happens as part of -test doesn't take into account the fact that the
Internal.Imports of a package do not contain "C", whereas the public
Imports do.

Therefore we skip the public Import of "C" if it exists and continue.

Change-Id: I5cdc8968890fa7e5da3e375718606037d3282754
Reviewed-on: https://go-review.googlesource.com/111175
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2 files changed
tree: f302071a99ac7904bebad5aef8ebd1ce38947ce5
  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
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