CBD-774: Add support for automake 1.13

Change-Id: I2ade1d84c778754a1b0fe96a61ad0716c2dd6d19
Reviewed-on: http://review.couchbase.org/23973
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>