Deep symlink copy doesn't work with relative `../foo` target

[Samuel Phan]

Deep symlink copy will fail in this situation:

test
├── data
│   ├── case00
│   │   └── README.md
│   ├── case01
│   │   └── README.md
│   ├── case02
│   │   └── README.md
│   ├── case03
│   │   ├── README.md
│   │   ├── case01 -> test/data/case01
│   │   └── relative_case01 -> ../case01

Though it's entirely acceptable to have a symlink working only at a certain current working dir, most of the time, we have symlinks:

• either to an absolute path
• or relative to itself (eg ../something). 🐛 This case doesn't work properly.

[dhamu]

changing from os.Readlink to filepath.EvalSymlinks worked in my local.