Create mk-chicken.scm

Hello!

I use chicken scheme so I made a version of `mk.scm` with small changes so that it loads in chicken.

To use `trans4.scm` I just have to change `(load "../../mk-implementations/scheme/mk.scm")` to `(load "../../mk-implementations/scheme/mk-chicken.scm")` and then start it with `rlwrap csi trans4.scm`.

Might be useful to others so i thought I'd PR!