multimedia/wl-screenrec: add new port

High performance screen recorder for Wayland. Requres a wayland
compositor supporting wlr-output-management-unstable-v1 and
wlr-screencopy-unstable-v1 protocols, like sway and Hyprland.

Uses dma-buf transfers to get surface, and uses the GPU to do both the
pixel format conversion and the encoding, meaning the raw video data
never touches the CPU, leaving it free to run your applications.

https://github.com/russelltg/wl-screenrec
(cherry picked from commit f88877ed5dfa34f9765be67de6a45b1a85733770)
(cherry picked from commit 6a9594ae1f5c30a92f5771af72c1dca272d26f50)
(cherry picked from commit 0374dbdc796a1930ae2ee41e1d5d60b1d07e7f70)
(cherry picked from commit 3d64949ca17ac208eedcfcbe14c925bccbb20b54)