x11/waylock: add new port

Waylock is a small screenlocker for Wayland compositors implementing
ext-session-lock-v1. The ext-session-lock-v1 protocol is significantly
more robust than previous client-side Wayland screen locking approaches.
Importantly, the screenlocker crashing does not cause the session to be
unlocked.

https://github.com/ifreund/waylock

PR: 269320
Tested by: Oleh Vinichenko