Experiment with incjecting another dir

To avoid building with a special voltron I'm just going to test
with a version where I'm adding a wrapper to the old Makefile

Change-Id: I4378c39ec39bd9bcb298f1c25dc1e0df3f11c934
Reviewed-on: http://review.couchbase.org/32714
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>