add pointer to license files to loci/pyloxi generated copyright headers
This indirection allows the project containing loci/pyloxi to pick the license.
diff --git a/c_gen/templates/_copyright.c b/c_gen/templates/_copyright.c
index cdde321..4d38f6d 100644
--- a/c_gen/templates/_copyright.c
+++ b/c_gen/templates/_copyright.c
@@ -28,3 +28,4 @@
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior University */
/* Copyright (c) 2011, 2012 Open Networking Foundation */
/* Copyright (c) 2012, 2013 Big Switch Networks, Inc. */
+/* See the file LICENSE.loci which should have been included in the source distribution */