MB-10731 Link failure on Ubuntu due to missing rtmp

Change-Id: Ib06f85cfbcdb6b21cb244614ab5fa6ca0974a976
Reviewed-on: http://review.couchbase.org/35211
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>