add makefile to fetch dynasm.

c/jit/.gitignore

/luajit
/hello_jit

c/jit/Makefile

dynasm: luajit
luajit:
	git clone http://luajit.org/git/luajit-2.0.git luajit

c/jit/dynasm

#!/bin/bash
lua $PWD/luajit/dynasm/dynasm.lua $*