os: skip TestReadlink sub-tests requiring symlinks when not enough
permissions are held
Some of the TestReadlink sub-tests require os.Symlink to succeed.
If the user doesn't have enough permissions to create symlinks, then
there is no point in running the test.
Change-Id: I06ec7e3ddf0016e804667bba0ee6ebe6baa01872
Reviewed-on: https://go-review.googlesource.com/c/go/+/614655 Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>