samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/nonprototypec.t

@@ -0,0 +1,12 @@
+C = terralib.includecstring [[
+	int foobar() {
+		return 3;
+	}
+]]
+
+
+terra doit()
+	return C.foobar()
+end
+
+print(doit())