fix .depend for parallel make

Damien introduced a dependency from asmcomp/ to typing/env.ml, which
breaks parallel build.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14767 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
[minor] Makefile: fix the hard-bootstrap recipe

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14768 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Fix PR#6405: unsound interaction of -rectypes and GADTs

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14769 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Update manpage