CBD-774: Add support for automake 1.13

Change-Id: I1207364c314fbd72b8975022d36128f370cf5906
Reviewed-on: http://review.couchbase.org/23968
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>