meson: Do not require shader cache for radv.

We fixed the compile error a while ago.

Fixes: cc10b34e9ed "util/disk_cache: Fix disk_cache_get_function_timestamp with disabled cache."
Reviewed-by: Drew Davenport <ddavenport@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5649>
1 file changed