PR#5201: ocamlbuild: add --norc to the bash invocation to help Windows performances

This change was recommend by daweil on the bugtracker. According to
the Bash documentation, the option -c that is already passed by
ocamlbuild should already imply --norc, but daweil reported a 30%
performance speedup with this change anyway. I'm a bit surprised, but
this cannot hurt...

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13969 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#4323: have "of_string" in Num and Big_int work with binary and hexa representations [patch by zoep]

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13970 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6116: more efficient implementation of Digest.to_hex [patch by ygrek]

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13971 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6071: Add a -noinit option to the toplevel [patch by David Sheets]

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13972 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02