add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  999427580cded403b4edc8a85088621f27493c489f08b9f564fb5fe76c16a883  log4cplus-1.1.2.tar.xz