Add observe_registry.cc to windows makefile
Add observe_registry.cc to windows makefile

Change-Id: I3b930053722fb69179c58cd516857a8bcc624680
Reviewed-on: http://review.couchbase.org/10339
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

couchbaselabs/ep-engine,owendCB/ep-engine,daverigby/kv_engine,jimwwalker/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,abhinavdangeti/ep-engine,membase/ep-engine,daverigby/ep-engine,owendCB/ep-engine,abhinavdangeti/ep-engine,sriganes/ep-engine,couchbase/ep-engine,sriganes/ep-engine,sriganes/ep-engine,teligent-ru/ep-engine,jimwwalker/ep-engine,daverigby/ep-engine,couchbaselabs/ep-engine,sriganes/ep-engine,jimwwalker/ep-engine,owendCB/ep-engine,membase/ep-engine,daverigby/ep-engine,hisundar/ep-engine,hisundar/ep-engine,daverigby/kv_engine,owendCB/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,membase/ep-engine,couchbase/ep-engine,daverigby/ep-engine,couchbaselabs/ep-engine,membase/ep-engine,daverigby/kv_engine,couchbaselabs/ep-engine,abhinavdangeti/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,abhinavdangeti/ep-engine,couchbase/ep-engine,couchbase/ep-engine,teligent-ru/ep-engine,hisundar/ep-engine,daverigby/kv_engine