follow up - sparsehash now doen't compile every time
follow up - sparsehash now doen't compile every time

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