to pull in the DNA/NaCl library and run the DNA main function from
there. So now dna binary still works, but uses libdnalib, so that we don't
need to duplicate NaCl library for dna binary versus access from in Java
(once we make the JNI wrappers for the functions we care about).
This sets the scene for making libdnalib also a JNI-compliant library
that we can use from Java to get access to the NaCl primitives, and
possibly even run DNA operations directly.
