added code to lisp_math.c to use SFMT for random number generation

I haven't finished writing it, I still need to add some typechecking to
be sure.

I also modified the my additions to SFMT to be a lot simpler, I don't
have separate files for static and re-entrant versions the static
versions are just wrappers around the re-entrant versions, passing static
values as arguments. I elminated seperate 32 and 64 bit versions for
everything but the actual random functions.