add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256    742f724b3a06c8fc4039591dba24871755728221ca5dc4afb78ebd9a7e3beb44    alljoyn-base-16.04.00.tar.gz