add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://sourceforge.net/projects/silgraphite/files/graphite2
md5 b39d5ed21195f8b709bcee548c87e2b5  graphite2-1.3.10.tgz
sha1 668f3bce96fc02d90ea875b401ed36b2e8957d2f  graphite2-1.3.10.tgz
# Locally computed
sha256 90fde3b2f9ea95d68ffb19278d07d9b8a7efa5ba0e413bebcea802ce05cda1ae  graphite2-1.3.10.tgz