add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From ftp://sourceware.org/pub/libffi/sha512.sum
sha512    980ca30a8d76f963fca722432b1fe5af77d7a4e4d2eac5144fbc5374d4c596609a293440573f4294207e1bdd9fda80ad1e1cafb2ffb543df5a275bc3bd546483  libffi-3.2.1.tar.gz
# License files, locally calculated
sha256    0f4d7a0bfb83c37465d42dc305f124189196cc0cc2cc8d6f8461103682aebbc5  LICENSE