add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# locally computed
md5    f3eeaed018542963b7d2416ef1135ecc    libevent-2.1.8-stable.tar.gz
sha1    2a1b8bb7a262d3fd0ed6a080a20991a6eed675ec    libevent-2.1.8-stable.tar.gz