Use /usr/bin/ in all paths for binaries
    
    Those old paths would still work, but would be confusing to new
    packagers, since we require that the real paths be used in %files [1].
    
    In particular, ldconfig was "moved" in [2] and sendmail in [3].
    
    [1] https://pagure.io/packaging-committee/pull-request/1355
    [2] https://src.fedoraproject.org/rpms/glibc/pull-request/91
    [3] https://src.fedoraproject.org/rpms/sendmail/pull-request/7