packaging: Readded SET(BOOST_LIBRARYDIR "/usr/lib64") to Cmake file if...

packaging: Readded SET(BOOST_LIBRARYDIR "/usr/lib64") to Cmake file if libboost_system.a exists there. (Fixes compiling on machine xtreem)

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2523 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534