[Pkg-rust-maintainers] Bug#1059268: rust-coreutils: add loongarch64 support

[zhangdandan]

Source: rust-coreutils
Version: 0.0.23-2
Severity: wishlist
Tags: patch ftbfs
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

Compiling the rust-coreutils failed for loong64 in the my local loong64 
environment.
The error messages are as follows,
```
......
Compiling uu_stdbuf v0.0.23 
(/home/build/rust-coreutils-0.0.23/src/uu/stdbuf)
error[E0308]: mismatched types
    --> src/uucore/src/lib/features/fs.rs:124:16
     |
111 |     pub fn number_of_links(&self) -> u64 {
     |                                      --- expected `u64` because 
of return type
...
124 |         return self.0.st_nlink;
     |                ^^^^^^^^^^^^^^^ expected `u64`, found `u32`
     |
help: you can convert a `u32` to a `u64`
     |
124 |         return self.0.st_nlink.into();
     |                               +++++++

For more information about this error, try `rustc --explain E0308`.
error: could not compile `uucore` due to previous error
```

I have added loongarch64 support for rust-coreutils.
The rust-coreutils source package was compiled successfully on my local 
loong64 rootfs environment.
Please consider the patch I have attached.
Your opinions are welcome.

thanks,
Dandan Zhang

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