misc: also check wheter binaries from /{s,}bin are /usr
This should hopefully avoid failing to build the initramfs when important binaries like /bin/busybox get moved to /usr.
Also complain loudly when there's a path mismatch, so people notice it.
included in systemd upgrade 256.11 as a temporary commit
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There should be an issue reverting after the /usr merge happened in alpine.