get rid of PATH_MAX in Mac OS X implementation
get rid of PATH_MAX in Mac OS X implementation

cvmfs/cvmfs,btovar/cvmfs,alhowaidi/cvmfsNDN,Gangbiao/cvmfs,cvmfs-testing/cvmfs,DrDaveD/cvmfs,reneme/cvmfs,DrDaveD/cvmfs,cvmfs-testing/cvmfs,Gangbiao/cvmfs,ruvolof/cvmfs,bbockelm/cvmfs,btovar/cvmfs,trshaffer/cvmfs,bbockelm/cvmfs,MicBrain/cvmfs,cvmfs-testing/cvmfs,MicBrain/cvmfs,cvmfs-testing/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,trshaffer/cvmfs,ruvolof/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,btovar/cvmfs,MicBrain/cvmfs,djw8605/cvmfs,MicBrain/cvmfs,ruvolof/cvmfs,alhowaidi/cvmfsNDN,bbockelm/cvmfs,cvmfs/cvmfs,bbockelm/cvmfs,Moliholy/cvmfs,DrDaveD/cvmfs,btovar/cvmfs,ruvolof/cvmfs,cvmfs/cvmfs,btovar/cvmfs,cvmfs-testing/cvmfs,cvmfs/cvmfs,alhowaidi/cvmfsNDN,ruvolof/cvmfs,DrDaveD/cvmfs,trshaffer/cvmfs,reneme/cvmfs,alhowaidi/cvmfsNDN,MicBrain/cvmfs,Moliholy/cvmfs,alhowaidi/cvmfsNDN,Moliholy/cvmfs,trshaffer/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,bbockelm/cvmfs,reneme/cvmfs,djw8605/cvmfs,cvmfs/cvmfs