Bad error handling in fs::status for errors on the symlink target

**Describe the bug**
The status result of symlinks to non-existing targets or targets that can not be accessed due to rights is wrong.

**To Reproduce**
Possible test path on Linux is `/proc/1/task/1/cwd`

**Expected behavior**
The error code should be set, file_type for symlinks to non-existing targets should be `not_found`.
