proxy: fix build issue with uring mode enabled
proxy: fix build issue with uring mode enabled

sorry, I'm still getting back into the swing of things. uring is still a
separate configure option so it requires paying attention to test.

memcached/memcached,dormando/memcached,dormando/memcached,dormando/memcached,memcached/memcached,memcached/memcached,memcached/memcached,dormando/memcached,memcached/memcached,dormando/memcached