Macro uucore::show_error_custom_description

macro_rules! show_error_custom_description {
    ($err:expr,$($args:tt)+) => { ... };
}

Show a warning to stderr in a similar style to GNU coreutils.

Is this really required? Used in the following locations:

./src/uu/head/src/head.rs:12 ./src/uu/head/src/head.rs:424 ./src/uu/head/src/head.rs:427 ./src/uu/head/src/head.rs:430 ./src/uu/head/src/head.rs:453 ./src/uu/du/src/du.rs:339 ./src/uu/wc/src/wc.rs:270 ./src/uu/wc/src/wc.rs:273