This will allow intel-clc tool to use the ELK nir_options in its NIR
codepath without having to link with the entire ELK compiler. That way
an Anv only build doesn't need to compile ELK.
Iris uses that codepath for Gfx8.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27563>
