[polyselect] unified computation of lq and k for 32- and 64-bit ulong
[polyselect] unified computation of lq and k for 32- and 64-bit ulong

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