add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From http://sourceforge.net/projects/libserial/files/libserial/0.6.0rc2/
sha1  e09113be3ba595135e95e853003ff96feea0da63  libserial-0.6.0rc2.tar.gz
md5  7787679b22901e4810bc53ecccdf8266  libserial-0.6.0rc2.tar.gz
# Locally calculated
sha256 35ee29eb1369d52ffb8658237577692f991eb508320d0abbb71c53e6494a1c23 libserial-0.6.0rc2.tar.gz