add missing instructions to ci-build for msvc

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14802 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
ci-build: do not change directory for Unix slaves

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14803 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Correct PR#6412 by ruling out sharing of Levents



git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14804 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02