MB-31971: Generate a library for generated flatbuffers
MB-31971: Generate a library for generated flatbuffers

Using a library allows for much more straightforward
dependencies (particularly when couchstore needs the
flatbuffers schema).

Change-Id: Ib99acdffce676d649ad1d0c9dbaa6d5f933c1b4b
Reviewed-on: http://review.couchbase.org/102259
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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