Add missing fixtures for escript test

lib/mix/test/fixtures/dep_with_protocol/lib/proto.ex

@@ -0,0 +1,3 @@
+defprotocol DepProto do
+  def hello(x)
+end

lib/mix/test/fixtures/dep_with_protocol/mix.exs

@@ -0,0 +1,9 @@
+defmodule DepProto.Mixfile do
+  use Mix.Project
+
+  def project do
+    [ app: :depproto,
+      version: "0.1.0" ]
+  end
+end
+

lib/mix/test/fixtures/escripttest_protocols/lib/escripttest.ex

@@ -0,0 +1,5 @@
+defmodule Escripttest do
+  def main([protocol]) do
+    IO.puts Protocol.consolidated?(Module.concat([protocol]))
+  end
+end