Add Reciprocal (RCP) Function. Fix a memleak.

--Makefile needs -lm so that the linker can actually find the fused
  multiply accumulate function. Maybe it should be inlined assembly
--RCP function is pretty cool, let's division be done by combining
  with MUL.
--There was a memory leak in fizzbuzz or a double free in the tests I
  didn't wrap in their own variable scope because either the return
  value of fizzbuzz wouldn't be freed or an element in the globalvars
  would be double freed.
--Fizzbuzz is annoying to run to 1000