Function cups_sys::qsort_r

pub unsafe extern "C" fn qsort_r(
    __base: *mut c_void, 
    __nel: usize, 
    __width: usize, 
    arg1: *mut c_void, 
    __compar: Option<unsafe extern "C" fn(_: *mut c_void, _: *const c_void, _: *const c_void) -> c_int>
)