add nkmcu

hc

2023-11-06 170c1c0fa90ad9f762d1877f8a57efce706fc95a

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# From http://sourceforge.net/projects/sidplay2/files/sidplay2/sidplay-libs-2.1.1/
sha1    8af6350866edc30b0d331e075fa97292f6f645a5    sidplay-libs-2.1.1.tar.gz