exp/terminal: add to level Makefile for the (non-Linux?) systems that need it.
exp/terminal: add to level Makefile for the (non-Linux?) systems that need it.

R=golang-dev
CC=golang-dev
http://codereview.appspot.com/5528102
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go