go modfetch includes the LICENSE file from the repo root when fetching
a submodule if the submodule does not contain a LICENSE.

This updates CreateFromVCS to match that behavior.

Fixes golang/go#60442

Change-Id: I5f9edb775bb330325783e1c30d7d16e436bda74c
Reviewed-on: https://go-review.googlesource.com/c/mod/+/498935
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>

CreateFromVCS returns UnrecognizedVCSError.

Change-Id: I54e9be4c44eb889657c581a34d38987042be9ad2
Reviewed-on: https://go-review.googlesource.com/c/mod/+/502435
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>

The wasmtime runtime does not permit absolute symlinks.

More generally: since this is an x-repo, we should not assume anything
in particular about the set of supported operating systems. We should
explicitly list the GOOS values expected to always support symlinks,
rather than the ones that are allowed not to.

Fixes golang/go#60795.

Change-Id: I1749429ac1178f261b4acfd97c0fcf9ec1c2a871
Reviewed-on: https://go-review.googlesource.com/c/mod/+/504075
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>

Change-Id: Ic9532893740b9952ca429106b3c373cc14d0383e
Reviewed-on: https://go-review.googlesource.com/c/mod/+/500875
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Oleksandr Redko <oleksandr.red@gmail.com>
Auto-Submit: Bryan Mills <bcmills@google.com>