anv: install the intel_icd.json to ${datarootdir} by default
As mentioned by the spec (and used by Archlinux and Debian) default to ${datarootdir} as opposed to ${sysconfdir} for the default location. Cc: Jason Ekstrand <jason@jlekstrand.net> Cc: mesa-stable@lists.freedesktop.org Signed-off-by:Emil Velikov <emil.velikov@collabora.com> Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net>