[yocto] remove unneeded files from update-alternatives packages

[Matthias Schoepfer]

Hi!

In my case, I am using coreutils and busybox. But I only need one
program of coreutils. Now, I have plenty binaries with .coreutils
installed in my image, which bloats the image (every byte counts ;) ).
Its a read-only-image, update-alternatives or package management is not
used. Is there a better way to remove the unneeded files then manually
removing them in a ROOTFS_POSTPROCESS_COMMAND?!

Thanks and Regards,

    Matthias

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