Revert "CI: build with CGO_ENABLED=0 on ubuntu1604"
Revert "CI: build with CGO_ENABLED=0 on ubuntu1604"

This reverts commit c99322d9153ce82a35417ef7283032ff95287210.

DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs