add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 fbfc65e39b3d4e2cb108c4ffa8c41fd02c07d4d436c594fff8dab1a6d5297f89 FreeImage3170.zip