stat: change in behavior from gnu-coreutils stat -c %N symlinks reported with double quotes instead of single

Non-critical change in behavior of the output of `stat -c %N` in rust-coreutils:
version:   rust-coreutils 0.2.2-0ubuntu2 amd64


Expected gnu-coreutils (9.5-1ubuntu1) behavior:
```
~$ stat -c %N /lib
'/lib' -> 'usr/lib'
```

Current rust-coreutils behavior:
```
~$  stat -c %N /lib
"/lib" -> "usr/lib"
```