Update base64.cpp for GCC 4.4
Update base64.cpp for GCC 4.4

git-svn-id: 553b94dfae0ccc3e2737802dbe58af8948fddf31@36 65acd1a6-8abf-2149-a1f9-7b6df881b4e2

DreadWingKnight/cbtt,DreadWingKnight/cbtt,DreadWingKnight/cbtt