add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://sourceforge.net/projects/liblo/files/liblo/0.26/
sha1    21942c8f19e9829b5842cb85352f98c49dfbc823  liblo-0.26.tar.gz
md5    5351de14262560e15e7f23865293b16f  liblo-0.26.tar.gz