packaging: Updated Gentoo specification.

The BabuDB replication dependencies, which were copied to /usr/share/${PN}/server-repl-plugin/lib, are no longer required and therefore removed.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3481 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534