use sax::Converter:: base64 code instead

use sax::Converter:: base64 code instead

Change-Id: I92fd4459bed7c38ff2063899b20d24d781ac45b

From b9f83fca37a3544b825de9d2f295090257d3477b Mon Sep 17 00:00:00 2001
From: Caolán McNamara <caolanm@redhat.com>
Date: Sat, 02 Jun 2012 22:14:45 +0000
Subject: ThreeByteToFourByte and friends are no longer in use

Change-Id: I9a2aaebfc5cc6b8b6327d61270043611283a6975

Gbp-Pq: Name CVE-2012-2665-binfilter.diff