MarsSeed [1] filed a deletion request for weston-eglstream-git [2]: Broken experimental build from 2020. No longer needed. Since that time, upstream has released the eGL(stream) support in their stable version, so it is available in Arch/extra/weston and AUR/weston-git.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/weston-eglstream-git/
