ignore inodes when running rpmdiff.
    
    https://koji.fedoraproject.org/koji/taskinfo?taskID=21649395
    failed in the rpmdiff stage with
    BuildError: The following noarch package built differently on different architectures: python3-ipaserver-4.6.0-1.fc27.noarch.rpm
    rpmdiff output was:
    error: cannot open Packages index using db5 - Permission denied (13)
    error: cannot open Packages database in /var/lib/rpm
    error: cannot open Packages database in /var/lib/rpm
    ....N...... /usr/lib/python3.6/site-packages/ipaserver/install/__pycache__/ipa_pkinit_manage.cpython-36.opt-1.pyc
    ....N...... /usr/lib/python3.6/site-packages/ipaserver/install/__pycache__/ipa_pkinit_manage.cpython-36.pyc
    on investigation the files on aarch64 and ppc64 were using 2 inodes
    on x86_64, i686, armv7hl, ppc64le, and s390x using 1 inode.
    if I manually run the diff with --ignore S changed to N the diff passes
    given that we already ignore sizes we should ignore inodes used also
    
    Signed-off-by: Dennis Gilmore <dennis@ausil.us>