Function fltk::gl::gluUnProject

pub unsafe extern "C" fn gluUnProject(
    winX: f64, 
    winY: f64, 
    winZ: f64, 
    model: *const f64, 
    proj: *const f64, 
    view: *const i32, 
    objX: *mut f64, 
    objY: *mut f64, 
    objZ: *mut f64
) -> i32