add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://sourceforge.net/projects/sidplay2/files/sidplay2/sidplay-libs-2.1.1/
sha1    8af6350866edc30b0d331e075fa97292f6f645a5    sidplay-libs-2.1.1.tar.gz