fca8748 Backport patch to use systemd-0.4.0 crate

Authored and Committed by jlebon 5 years ago
    Backport patch to use systemd-0.4.0 crate
    
    Otherwise the `patch.crates-io` directive throws off `cargo vendor` and
    `cargo build` then tries to fetch from `github.com/jlebon/rust-systemd`.
    
        
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