add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From https://github.com/json-c/json-c/wiki
sha256  b8d80a1ddb718b3ba7492916237bbf86609e9709fb007e7f7d4322f02341a4c6  json-c-0.15.tar.gz
# Locally calculated
sha256  74c1e6ca5eba76b54d0ad00d4815c8315c1b3bc45ff99de61d103dc92486284c  COPYING