loci: centralize copyright header
diff --git a/c_gen/templates/locitest/main.c b/c_gen/templates/locitest/main.c
index c3c9a77..df80f9f 100644
--- a/c_gen/templates/locitest/main.c
+++ b/c_gen/templates/locitest/main.c
@@ -1,3 +1,5 @@
+:: include('_copyright.c')
+
 /**
  * @file test_main
  *