deps: backport bd1777fd from libuv upstream

Original commit message:

    unix, win: consolidate mutex trylock errors

    Fold EAGAIN into EBUSY, and make it the only acceptable error.

    PR-URL: https://github.com/libuv/libuv/pull/535


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

PR-URL: https://github.com/nodejs/node-private/pull/54


Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>