add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally computed:
sha256  686bcfb44e50b96345aa53f41e285f2118a2cf87a333b69b74165a2e7ddca492  libdmtx-0.7.4.tar.gz