This script hasn't seen an update in multiple years, update it to the
latest version provided upstream.
Both `config.guess` and `config.sub` are copied from upstream[1] and not
modified.
The full changelog is available within the upstream repository[1].
[1]: https://git.savannah.gnu.org/git/config.git
Link: https://github.com/openwrt/openwrt/pull/16536
Signed-off-by: Robert Marko <robimarko@gmail.com>
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