add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  1164b574e93a44c2a2e76c0c68d8d60437bd884a6c964d9c68be1556278e3d2d  xl2tp-v1.3.8.tar.gz