Remove unused typedef
Remove unused typedef

Change-Id: I860dc4955af43794d916b7212535d0621f4fbe6e
Reviewed-on: http://review.couchbase.org/53279
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

cloudrain21/memcached-1,owendCB/memcached,couchbase/memcached,daverigby/memcached,daverigby/memcached,couchbase/memcached,daverigby/memcached,daverigby/kv_engine,owendCB/memcached,cloudrain21/memcached-1,daverigby/kv_engine,owendCB/memcached,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/kv_engine,cloudrain21/memcached-1,couchbase/memcached,cloudrain21/memcached-1