add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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# Locally computed:
sha256  30719c9a4ffbcf15676b8f528233ccc54ee6cba96cb4590975f5fd60c68a066f  netcat-0.7.1.tar.gz