MB-100: Fix build error on windows.
MB-100: Fix build error on windows.

On windows, std::tr1 doesn't have definition for
static_pointer_cast

Change-Id: If978d165bd55833fde34e03a4e650eeb94166db5
Reviewed-on: http://review.couchbase.org/28149
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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