init 5.10_rt with nkio nkmcu

hc

2023-12-06 d38611ca164021d018c1b23eee65bbebc09c63e0

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# Locally computed
sha256    0f35051cc030b87c673ac1f187de40e386a1482a0cfdf2c552dd6031b307ddc4    isl-0.18.tar.xz