Sometimes, users don't have a recent enough version of wayland-protocols
to build Mesa. But these days, Meson's WrapDB has a wrap that's more
than new enough for our needs.
If we add the wrap-file to the subprojects folder, we'll download a more
recent wrap if the installed version is too old (or doesn't exist at
all).
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25683>
