Use System.services_timeout/0 in Mix.

Author: alexrp

lib/mix/lib/mix/server.ex

@@ -12,7 +12,7 @@ defmodule Mix.Server do
   end
 
   def call(arg) do
-    :gen_server.call(__MODULE__, arg)
+    :gen_server.call(__MODULE__, arg, System.services_timeout)
   end
 
   def cast(arg) do