[Nix-dev] patches to add mkcl and fix ecl

[Michael Raskin]

>attached are two patches:
>
>1) to add mkcl, a common lisp implementation

Applied, thanks

>2) to fix ecl, another common lisp implementation

I think adding a wrapper that sets NIX_CFLAGS_COMPILE and 
NIX_CFLAGS_LINK is a better last-ditch solution than just forbidding
libffi (I don't remember if ECL has an option to just add generic 
cflags).

>Would it be possible to get it committed?