unwind 0.3.0

An interface to libunwind
Documentation 
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use std::env;

fn main() {
    let version = env::var("DEP_UNWIND_VERSION").unwrap();
    let mut it = version.split(".");
    let major = it.next().unwrap().parse::<u32>().unwrap();
    let minor = it.next().unwrap().parse::<u32>().unwrap();
    if major < 1 || (major == 1 && minor < 2) {
        println!("cargo:rustc-cfg=pre12");
    }
}