add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://gnuradio.org/releases/gnuradio/sha256sums
sha256 87d9ba3183858efdbb237add3f9de40f7d65f25e16904a9bc8d764a7287252d4  gnuradio-3.7.11.tar.gz