Remove compile warning about attribute unused
Remove compile warning about attribute unused

It's not needed to add a visibility macro to an enum

Change-Id: Idbfedbef43838b6534b147711f65ea12906a4ab7
Reviewed-on: http://review.couchbase.org/90342
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine