busybox

- shrink mkswap and make v0 support optional. Thanks also to Tito for his ideas.
  http://busybox.net/lists/busybox/2006-March/019326.html

   2137	      8	     28	   2173	    87d	util-linux/mkswap.o.orig
   1890	      8	     28	   1926	    786	util-linux/mkswap.o.v0+v1
   1560	      4	     28	   1592	    638	util-linux/mkswap.o.v1