Correct incompatability with newest libuv version.

Change-Id: I107f525ed0aa313f616e03c7a2fba36d0009ab35
Reviewed-on: http://review.couchbase.org/38250
Reviewed-by: Brett Lawson <brett19@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Brett Lawson <brett19@gmail.com>