still porting testsuite to msvc64

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13658 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
ignore *.exe.manifest files

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13659 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02