PR#4099: Bug in Makefile.nt: won't stop on error

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15358 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Get rif of multiple exceptions with the same name in the same module.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/constructors_with_record4@15384 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Bootstrap.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/constructors_with_record4@15385 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Synchronize with trunk.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/constructors_with_record4@15386 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02