add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://www.tarsnap.com/scrypt/scrypt-sigs-1.2.0.asc
sha256 1754bc89405277c8ac14220377a4c240ddc34b1ce70882aa92cd01bfdc8569d4  scrypt-1.2.0.tgz