Function glib_sys::g_utf8_to_ucs4

pub unsafe extern fn g_utf8_to_ucs4(str: *const c_char,
                                    len: c_long,
                                    items_read: *mut c_long,
                                    items_written: *mut c_long,
                                    error: *mut *mut GError)
                                    -> *mut u32