Builds the uutils multicall binary containing all utils (except stdbuf)
by default. To only build a subset
`cargo --no-default-features --features <utils>`
can be used.
Whats missing is building the standalone binaries and a mechanism to
automatically disable the build of unix only utils on windows.
I switched over to the getopts crate on crates.io, instead of Rust's
private implementation. This will allow coreutils to build for Rust 1.0.
I'm splitting the updates into several commits for better reviewing.
This patch begins the work of modernizing uutils to work with 1.0-ish
Rust. In particular, it
1. Updates to the latest submodules.
2. Convert mkmain.rs, mkuutils.rs, and src/uutils/uutils.rs
to new slice syntax and use of new io, fs, and path APIs.
3. Convert src/common/util.rs to new io, fs, and path APIs.
4. Convert fmt to use new APIs.
