Exclude perl-Compress-Raw-Zlib from CentOS updates

need to exclude this from updates as its causing install fail on dependencies. 
http://mirror.centos.org/centos/6.5/os/x86_64/Packages/ only holds perl-Compress-Zlib-2.021-136.el6.x86_64.rpm to the 2.052 version required.

2.052 is then found in rpmforge-extras