Restore commit cut in previous commit, drop conditionals
All the with_python3 conditionals don't make much sense now. At
first I was going to *add* with_python2 conditionals so the
spec still worked for older Fedora and EPEL, but I'm going to
send 0.6.0 to Rawhide and that probably shouldn't go to older
branches, so we're going to wind up with the spec split between
branches anyway...