add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally computed:
sha256    9c09c6e9fc95207c7d45944f8b669f2454056bef2bbaef70c94ba3f81be1cbb2    safeclib-v09102017.tar.gz
sha256    c33e77efd5781e3d59a2bb648c82d2a615035ef0d24cf58880380e3af906510b    COPYING