PR#5827: provide a dynamic command line parsing mechanism

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13772 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
ignore generated files

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13773 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02