PR#6406: Expose OCaml version in C headers

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15016 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6453: It should be documented that Lexer.set_preprocessor receives EOL tokens

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15019 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02