Add alloc_hooks.c to fix build error
Add alloc_hooks.c to fix build error

Change-Id: I814f1e659711b772095dede6909bc1fd027b6a4d
Reviewed-on: http://review.couchbase.org/14034
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Reviewed-on: http://review.couchbase.org/14272
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbase/memcached,jimwwalker/memcached,abhinavdangeti/memcached,jimwwalker/memcached,cloudrain21/memcached-1,mrkwse/memcached,owendCB/memcached,daverigby/memcached,abhinavdangeti/memcached,owendCB/memcached,daverigby/memcached,abhinavdangeti/memcached,abhinavdangeti/memcached,couchbase/memcached,daverigby/memcached,mrkwse/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/memcached,owendCB/memcached,daverigby/kv_engine,daverigby/kv_engine,couchbase/memcached,jimwwalker/memcached,daverigby/kv_engine,cloudrain21/memcached-1,cloudrain21/memcached-1,mrkwse/memcached,mrkwse/memcached,cloudrain21/memcached-1,abhinavdangeti/memcached,couchbase/memcached