add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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config BR2_PACKAGE_LIBNET
    bool "libnet"
    help
      libnet provides a portable framework for low-level network
      packet construction.
 
      http://sourceforge.net/projects/libnet-dev