toybox has md5sum, so lose toolbox's md5.

We've now removed enough that for the first time toolbox has
dipped below toybox in size:

  -rwxr-xr-x root     shell      230800 2014-12-11 18:55 toolbox
  -rwxr-xr-x root     shell      233632 2014-12-11 18:32 toybox

Change-Id: I6b150f195dd9f803ddce58a89aa7c23a5b930e5b