Fix gh-1083: crash due to a NULL callback in libeio
Fix gh-1083: crash due to a NULL callback in libeio

Updated libeio invokes done_poll callback but we weren't providing one.

ocelot-inc/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,mejedi/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,ocelot-inc/tarantool,mejedi/tarantool,mejedi/tarantool,ocelot-inc/tarantool,mejedi/tarantool,rtsisyk/tarantool