add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From: http://snapshot.debian.org/archive/debian/20141023T043132Z/pool/main/a/at/at_3.1.16-1.dsc
sha256 cb9af59c6a54edce9536ba629841055409d1f89d8ae26494727a97141fb4d5c1  at_3.1.16.orig.tar.gz