add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from http://pypi.python.org/pypi?:action=show_md5&digest=e849af7f8b7ec75cbc7a53da67c51a51, sha256 locally computed
md5     e849af7f8b7ec75cbc7a53da67c51a51  pyserial-3.1.tar.gz
sha256  c8ffdcbd8bfd308842409e558848c32aa3499a1bfe95a591e4210072b9520f1e  pyserial-3.1.tar.gz