add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From https://sourceforge.net/projects/iperf2/files/
sha1    8b44a23385044bb454e7891966c37339d3bb3711    iperf-2.0.10.tar.gz
# Locally computed:
sha256  7fe4348dcca313b74e0aa9c34a8ccd713b84a5615b8578f4aa94cedce9891ef2  iperf-2.0.10.tar.gz
sha256  5f9f5c4feca3347c3b3c0ada8b16b4e6b698aac4e6f016a24adf61a5915336d1  COPYING