Reverting -with-frame-pointers

Fails to compile alt-ergo without frame-pointers. No time to debug
before tonight, so I revert and will merge again after fixing the
problem.



git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13732 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02