[las-norms.c] replaced pow(...,d) by loop, solves bug #14988
[las-norms.c] replaced pow(...,d) by loop, solves bug #14988

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