Build libgen from sources using buck

Change-Id: I438d02e86c34f8e5a7bd1203e1c67ba191c186c6
diff --git a/lib/BUCK b/lib/BUCK
index f54426d..c357a13 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -1,4 +1,5 @@
-# ***** This file was auto-generated at Fri Jan 20 11:48:05 PST 2017. Do not edit this file manually. *****
+# ***** This file was auto-generated at Thu Jan 26 15:48:58 PST 2017. Do not edit this file manually. *****
+# ***** Use onos-lib-gen *****
 osgi_feature_group(
   name = 'COMPILE',
   visibility = ['PUBLIC'],