add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from http://http://sourceforge.net/projects/pyqt/files/PyQt5/PyQt-5.7, sha256 locally computed
md5    e3dc21f31fd714659f0688e1eb31bacf  PyQt5_gpl-5.7.tar.gz
sha256    892693ba5f79989abb2061dad2d5c4e6f127e9dd3240f73f8220c7152cd35b05  PyQt5_gpl-5.7.tar.gz