src: use uv_stream_t, not uv_stream_s

PR-URL: https://github.com/nodejs/node/pull/16512
Refs: https://github.com/libuv/libuv/issues/1607


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>