client: Fixed Cmake file for MacOSX. Boost libraries are statically linked now.

If there is no system wide boost installation available, the option -DBOOST_ROOT=<path to boost *root* directory, including compiled libraries> has to be specified when calling "cmake".


git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2521 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534