add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://sourceforge.net/projects/perfmon2/files/libpfm4/:
sha1  2ed06d6e746f7b1cd4b70e9736e621052f60d625  libpfm-4.6.0.tar.gz
md5  5077b9022440e4951d96f2d0e73bd487  libpfm-4.6.0.tar.gz
# Locally calculated
sha256  5ab1e5b0472550f9037a8800834f6bc3b927690070f69fac0b67284b4b05fd5f  libpfm-4.6.0.tar.gz