Note this directory is created mainly for easy distribution of BuckleScript
We need copy config.ml(i) lexer.ml(i) parser.ml(i) runtimedef.ml(i) from ocaml 4.02.3 distribution
config.ml(i) are changed to dummy, since those configurations only make sense in C/ASM/Bytecode backend.
The runtime should be rewritten to avoid using (String/Bytes) (since we modified it) any standard library.
Since BuckleScript has different cmi_format from 4.02.3 due to
external attributes, so cmis generated by OCaml 4.02.3 is not ABI
compatible with cmis generated by BuckleScript