uutils-coreutils: init at 2018-02-09

`uutils-coreutils` is an a cross-platform rewrite of GNU/coreutils based
on Rust. It aims to increase portability and improve Windows support
(see https://github.com/uutils/coreutils#why).

Since the derivation provides the same binaries as `coreutils` does a
`prefix` argument as been added to the function to avoid any conflicts
that can be used like this:

``` nix
self: super:
{
  uutils-coreutils = self.uutils-coreutils.override { prefix = "uutils"; };
}
```

Resolves #28114 /cc @NeQuissimus

-----
Important notice: the patch depends on #34505 which needs to be merged
*FIRST* as it fixes a bug in the `rustc` setup of nixpkgs (see the PR's
discussion and https://github.com/rust-lang/cargo/commit/5c9665f41c6b4d3b99d3b9f8b48a286f5f154692#commitcomment-27271420 for further reference).

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