macros: automatically strip dev-dependencies
    
    All background written in upstream cargo GitHub issue[0].
    
    In short, cargo build/install enforces us to have all dev-dependencies
    even they are not used for building/installed.
    
    [0] https://github.com/rust-lang/cargo/issues/3732
    
    Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>