cmd/internal/moddeps: walk GOROOT when it is a symlink
Fixes #64375
Change-Id: I24ce67ef254db447cdf37a3fda5b5ab5fc782a36
GitHub-Last-Rev:
05590b9e20b31413d455a6e87bc38843e33ff116
GitHub-Pull-Request: golang/go#64376
Reviewed-on: https://go-review.googlesource.com/c/go/+/544757
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>