math/ocamlgsl: update 1.15.1 -> 1.19.1
- master site changed from bitbucket to github
PR: 211444
Changes: https://github.com/mmottl/gsl-ocaml/blob/master/CHANGES.txt
Submitted by: Rainer Hurling <rhurlin@gwdg.de>
Approved by: Michael Gruenewald <michipili@gmail.com> (maintainer timeout)