[minor] partial revert of trunk@14535 to make Windows CI happy

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14539 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
CI golf: try a better fix for tools install in Makefile.nt

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14541 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
minor Makefile.nt fix

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14542 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
make clean: remove *.cmt and *.cmti files

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14543 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
start fresh copy of trunk at rev 14543

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/safe-string@14544 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02