Function indy_sys::logger::indy_get_logger

#[no_mangle]
pub unsafe extern "C" fn indy_get_logger(
    context_p: *mut CVoid, 
    enabled_cb_p: *mut Option<EnabledCB>, 
    log_cb_p: *mut Option<LogCB>, 
    flush_cb_p: *mut Option<FlushCB>
) -> Error