add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# sha1 from sourceforge, sha256 locally computed
sha1  04b3e21b8c951d27f02fe91249ca3474554af0b9  libb64-1.2.1.zip
sha256  20106f0ba95cfd9c35a13c71206643e3fb3e46512df3e2efb2fdbf87116314b2  libb64-1.2.1.zip