skip debugger test if dynamic linking is not available

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14488 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
fix tabs vs spaces

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14489 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02