NCBC-191: Update Enyim submodule to latest commits

Change-Id: I1c5871d6e5de37fcdf0087a56f9fd09c96b41238
Reviewed-on: http://review.couchbase.org/24310
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: John C. Zablocki <john@couchbase.com>