Use single-word division in modredcul_initmod_ul()
Use single-word division in modredcul_initmod_ul()

This is a little nicer for CPUs that don't have a long division instruction

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs