PR#5371: a partial patch by Edwin Török to fix the FreeBSD failure

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14891 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Revert "merge branch "safe-string""

This reverts commit 33a2cfe03be18ff66c4db833dc60d7e0a0841613.
fix Makefile after split
compile with 4.01
clean
gitignore
makefile
rm ocamlbuild files
fix parallel build