handling of CVMFS_INSTALL_LIBDIR for older cmake
handling of CVMFS_INSTALL_LIBDIR for older cmake

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