Link with -lrt
Link with -lrt

Change-Id: I1628328aefc8c97e70145c53f50734084f3bdaf7
Reviewed-on: http://review.couchbase.org/28662
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

vmx/platform,trondn/platform,vmx/platform