Log Message:
Update to gprolog 1.2.16.
NetBSD patches were apparently merged in version 1.1.7
Since then, several releases have been made, so that the list of changes
is too extensive to be included here.  Please see
ftp://ftp.inria.fr/INRIA/Projects/contraintes/gprolog/NEWS and/or the
documentation in this package.
This addresses PR pkg/18962 by Mr. Jan Schaumann.