Paul O’Connor reviews a new biography of a 19th-century immigrant who battled discrimination against himself even as he fought for freedom for those who were enslaved. Reviewed by Paul T. O’Connor THE IMMORTAL IRISHMAN. By Timothy Egan. Brilliance Audio. 14 hours, 9 minutes. Read by Gerard Doyle. $11.95 Audible Download. Also available in paperback. Mariner Books. 384…